As the title says, this is for WMs (openbox, i3, etc).
Which is your suggestion for a minimalistic WM, not exactly the packages you’re used to but the ones you think any new user will be able to get the system up and running.
panel/launcher - this probably needs to be specific to the wm in question. Especially in configuration.
terminal - termite or qterminal
login/logoff helper - again, it seems like this would be environment specific.
With wm’s, it seems like the more light/minimal it can be the better. Also, while it would be pretty easy to align applications, I think trying to align things like panels and panel content would be odd. Especially since there is a mix of stacking and tiling window managers there.
file manager : pcmanfm since openbox is gtk goodchoice
panel or launcher tint2 , plank downunder is also nice to have
terminal , lxterminal if you like termite , i would rater use kitty is just a funny name but moderner. myself i use alacritty is almost like termite but lesser deps?
some login/out/off helper , a Script since oblogout is in aur ?
On Portergos I had some theming issues with pcmanfm, so i think thunar may be a good option, is modular enough so it won’t bring much xfce4 dependencies.
I mentioned thunar as well but now that I think about it can thunar provide a desktop? We probably need something that can provide a desktop for the wms that don’t support that on their own.
I guess the alternative would be to provide something like feh? That doesn’t seem like the most user-friendly option.