I never had dualboot, even when I started with Linux. Windows down, Ubuntu on it. And now I only use EOS, but I still have Manjaro on a stick for emergencies. Finally decided to use Xfce, but that’s not set in stone. When Plasma 6.1 is out, I will try it again.
Windows on a old hdd, dual booted Arch and EnOs on another hdd.
I have a CentOS distro running on one of my laptops and 1 server. Windows when I have to and EOS of course. You don’t have CentOS, OpenSUSE or RHEL choices.
Ialso run many OSs in Virtual mode, it has become a hobby 

Since one of those is a zfs member you could have any number of distros in there. ![]()
Certainly, although they are only dedicated or complete:
sda → FreeBSD
sdb → EndeavourOS
sdc → nomadBSD
I use a combination of distros, in different situations.
Main workstation - My main workstation quad boots Arch, Fedora, Manjaro and NixOS out of a single zfs pool. Arch and Fedora are configured in such a way that I can seamlessly boot between them with little difference. The Manjaro install is currently a little stale and the NixOS install is mostly unconfigured. I primarily use the Arch install.
Main laptop - My primary laptop is running EndeavourOS. 
Long term test laptop - My long term test laptop is currently running Fedora but since I just did an extended test of Fedora on my main workstation, it will get replaced with something else when I come across something worthy of a long term test. Before Fedora I used it to test Solus, NixOS and Void most recently.
Servers - Most of my servers run NixOS. The repeatability of the declarative config and the automatic updates make maintenance close to nothing once they are setup.
Desktop VMs - I keep ~75 VMs of varying Linux distros for testing purposes as well.
From bottom to top:
In my case I don’t use servers, I just use BSD as a desktop, and I don’t use the ports either, I just do everything I need with pkg.
I have seen your post regarding Fedora and you have achieved an incredible dynamism there !
My Ultrabox runs PacBang with OpenBox since 2017 and I never had a single problem, incredibly faithful !
On my workstation or PC-Desktop, for me, I use both BSD and EndeavourOS indistinctly, since computing, is for me a hobby, a great pastime that makes me forget a little of what I’m going through in my life …
EOS on the old laptop that’s my sandbox for playing with linux stuff without worrying about breaking things. Manjaro on my main desktop and little tablet-pc. Ubuntu on the computer at my university office, mainly because I sometimes don’t go there for weeks at a time (especially in these covid times), which makes a rolling release tricky. Thinking hard about switching my main home desktop to EOS, but I’ll probably wait for the holidays when I have some free time.
My lappy runs EOS, my desktop runs win10+EOS, my web servers run Arch, my media server runs ubuntu (for no real reason) and I have macOS on a MBP somewhere. Aside from work and certain games, I’m mostly in the Linux sphere.
Arch on my daily driver desktop PC, and Debian Sid on my secondary desktop PC.
Arch or Debian Sid on my various laptops.
EndeavourOS on a VM, and 9front on another VM.
Finally, I have the SSD that used to be my daily driver. It has SolydXK on it. I connect the SSD and boot into it once a month or so to update.
I have EndeavourOS on my desktop and laptop…pure. Why would I want anything else?
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- On my main gaming computer:
- SSD: Windows
Only reason I have this partition is because I intend on selling the PC next summer, so will be easier to reformat from a windows partition. Plus, saves the buyer having to buy a windoze license. - HDD: MX Linux
Only partition I use. Haven’t used windows partition since installing MX Linux.
- On my old gaming laptop:
- Solus and Windows
Solus/System-d destroyed my boot partition
So, I can only boot into Solus - Which in all honesty isn’t that bad, as I only wanted to dual boot in case I need Windows in an emergency.
- Sister’s 2x old HP Laptops for College & Uni:
Endeavour OS on the one (Single boot)
Elementary OS on the other (Single boot)
On my PC I have an NVME with Windows 10 and a SATA with EndeavourOS. I only use the Windows drive for gaming and any other task where I may need to use Windows. For everything else, I roll with EndeavourOS.
nobody perfect
… i just joke with you
your machine your rules 
Hmmm - I’ve been dual-booting for a LONGGG time now - 1993? Windows and TAMU. Lilo wasn’t great, but it worked…
Machine 1
- EndeavourOS
- Arch
- Garuda
- Xubuntu 20.04
- ?? testing…
Machine 2
- EndeavourOS XFCE
- EndeavourOS Cinnamon
- Arch XFCE
- Arcolinux
- Xubuntu Rolling Rhino (currently rolling as Gorilla 20.10)
- MX Linux 19
- Arch - bloated (!) testing
Machine 3
- 9 X EndeavourOS (all DE testing - see Wiki pt 2
)
Why? Well -
- Habit
- Having a working system always available
- Testing capabilites
- General knowledge
- sometimes can test stuff for helping others
- Nuts? - probably, but they are shrinking slowly as I go. Tending to standardize on XFCE - and EnOS is the least work to run/fix
Edit: Forgot inherited sister’s laptop…
- Win 7
- Arch
gave me practice for BIOS Arch install - proved I could pass their test
Woah!!
And I thought I had quite a few distros/systems to keep on top of managing/updating. 
Shoot, that’s a lot of stuff to maintain…i’m more lazy, i only have Endeavour here - no dual boot or whatsoever.
It’s not as bad as it seems - once I’ve seen what the updates are once - then I don’t have to pay much attention to the rest! What that means as a practical matter is that I use the KVM to swap between machines 1 & 2 - and third is hooked to the TV, so updates started during ads while watching the game… 
The only tricky one of the rest is the rolling Ubuntu - and it has been surprisingly stable so far…
My first dual boot was win98SE/XP. Anyway that desktop is retired.
My desktop is multi-boot with Win10(stale)/Manjaro(stale)/Mint + spare partitions for bare metal testing. My new laptop was going to have Manjaro/Win/Mint, but at the moment it has Win10/EnOS/Sparky - though Sparky’s kernel is still too old for the hardware. I also have a battleworn UEFI32 baytrail 2-in-1 that has hosted (triple boot) win8/win10/Ubuntu/Mint/Manjaro/Manjarox32/MX-Linux/Peppermint among others. Any distro that can host Cinnamon easily is interesting to me.