It was mostly rhetorical. There’s no way to know that you want the application to have extra access to some folder needed for your theme. That’s the exact kind of thing that would be better handled on a user-input level. You applied your theme, you notice that it is broken with the app, you apply the new expanded permissions to get it to work with your theme.
VanillaOS is pretty neat. It has an immutable (kind of) OS, lets you choose which package formats you want to use (flatpak, snap, appimage, etc) and leverages containers (a la Distrobox) and their package manager Apx to give you seamless access to packages on other distros. It’s Ubuntu-based right now but the next release is switching to debian.
To be fair, I don’t have much time on it. My daily drivers are a chromebook and a steamdeck, but I did dust off an old laptop just to check it out for a little bit.