Comment 15 for bug 1887804

> `$XDG_CONFIG_HOME/$SOFTWARE_NAME` is the de facto way

That's different from "does not follow the XDG base directory specification".
A specification (hopefully) is unambiguous. Anything else has little objective value.

> That snap will behave the same across distributions

That sounds like a reasonable assumption to me.

> that snap is supported on different distributions at all

That's not an assumption, it's a fact: https://snapcraft.io/docs/installing-snapd.

> that someone even wants to install the snap package

Most (average) users don't care about packaging formats at all (nor do they care where software stores their cache/config, for that matter).

> All of them are frankly really bad assumptions and just cause people pain.

That's just your opinion/perception.
I'm marking again this bug as a duplicate of bug #1575053. Please file a new bug for the migration of existing profiles that doesn't work for you (with details on your profiles layout), so we can track the issue separately.