It's just as true today, though. When the Rust mod team resigned en masse in 2021, it was announced by a programmer (the author of ripgrep) [0], and the conflict was with the core team (also programmers). A supermajority of the contributors to open source projects are programmers, so most famous meltdowns are going to be conflicts between programmers, not between programmers and the tiny minority of non-technical contributors.

I'm still waiting for anyone to give an example of an open source project meltdown that was triggered by non-technical contributors.

[0] https://github.com/rust-lang/team/pull/671

More recent example:

https://github.com/kovidgoyal/kitty/issues/879