Sorry for missing something I should have mentioned, I just remembered just a few minutes ago. (because I just installed the latest EndeavourOS on a very old machine, more than 10 years old, and did not have the luxury of having systemd-boot, only Grub, so this is how I remembered)
Some time ago, with the help of our friends and experts here I could create a “hook”, a little script that runs automatically if a certain condition occurs. That hook automatically installs Grub in case it needs to be installed, so you do not have to worry about Grub breaking. I tested it and lived with it for some time and it was OK, it removed the hassles I mentioned previously. you may check my thread and the hook at Grub Hook to grub-install and grub-mkconfig?
I hope this helps.
But still, I (as my own personal thinking) I did not like the idea of a software change that may lead to an ubootable system or require such attention from the user. I just thought how would I be sure that nothing similar will happen again in the future so that the hook might not work! I don’t mind a bug or whatever breaking with any app, but when it comes to data loss or unbootable system I am very very careful. Whatever software breaks I can simply reinstall it or even installan alternative easily, just really easy, but when it comes to these two, I can’t take it.
So, this is why I am sticking to systemd-boot.