The last issue that caused them to leave was their desire to move mpv to their own build system, which they believed they could write in a weekend. Other mpv developers thought that was a stupid idea and argued in favor of something more standard, such as meson. That was the last straw for both sides.
> Other mpv developers thought that was a stupid idea and argued in favor of something more standard
That doesn’t seem right either. I just read the whole PR thread and I see a bunch of users arguing for it, not other maintainers.
The maintainer was certainly controversial and I found several commits and bad decisions which look to be almost universally hated, but it’s not clear to me this specific problem was what caused them to quit or that it was motivated by other maintainers.
If you could provide a source for your claim, it would be appreciated.
It's a former developer that's no longer affiliated with the project since 2021 or thereabouts. They did not part on good terms because he behaved in the same way towards other mpv developers, "my way or the highway".
So you probably shouldn't let anything that old sour your opinion on the current mpv.
(I don't belong to either side, just have been using the player since its inception.)