I understand why companies do this but I sure don't like it. They often use Discourse, which I find to be a lot less readable than GitHub (the design follows what I call "duploification" -- the elements are all large and surrounded by too much whitespace!)

On top of that it's yet another site I have to sign up with if I want to interact with the community.

I'm also mindful of the risks of centralization. Discord and its lack of external archives is a prime example of how that can be harmful. I'm just not sure if that risk outweighs the costs and annoyances.