I see where you're coming from, though having the instance be related to the underlying software helps a lot with clarity. I still have trouble remembering whether programming.dev is a Lemmy or Mastodon instance, whereas lemmy.ca causes no such issues.

Also, with Kbin and Mbin, I don't think it's much of an issue. Kbin.run uses Mbin, and I've never seen that as odd. The differences between the two aren't very significant anyway (i.e., it's clear that they're both versions of the same general thing). I could see it being a problem if you wanted to switch your instance from Kbin to Lemmy, but that seems like an unlikely scenario that isn't worth the sacrifice in clarity.