I just want something like this but with Arch.
All distros are basically the same but with different default packages and package managers.
Fortunately, regolith is open source and has repos for their default configs. Get the right packages installed on Arch and copy the regolith configs for those packages. and you have yourself an arch regolith clone.
But it would just be nice to have the full DE backing behind i3 as a distribution. Yes I know you can do everything here with list of tools, but I just want a configuration that I know has been thought out, with best practices, and easy to modify in a reproducible way. The list of dotfiles and little adjustments alone you need to marry i3 with a power manager, menu bar, network manager, is a lot! I just want the work done for me (a DE).
It seems to me you are introducing complexity for complexity sake, with nothing to be gained - except maybe nerd credential points for using i3?