This is the perennial argument that IMHO is based on a fallacy. If the vim people suddenly stopped working on vim, it doesn't mean all their effort would go to neovim. People work on what they want to work on in open source. Also the two projects have very different goals/philosophies. The code bases have also gotten pretty different in architecture because neovim did a monstrous refactor. It's open source working as intended that we have both.

I agree with you.

One little thought is, has there been much drama between the vim and neovim communities? (I guess community can be defined broadly enough that the answer to that question is always “yes,” but I haven’t seen much). They both seem completely happy to just do their own thing. I think the perennial argument just exits in the mind of some fans.

It is nice to see a pair of projects with so much potential for competition coexisting peacefully. Plenty of room on the internet I guess.