Well, the point is I don't want CoMaps to win out over Organic Maps, I want some open source alternative to win out over Google Maps. Which is why I'd hesitate to say that LibreOffice "won" over anything, Google and Microsoft seem to be doing most of the winning in that particular space.
In a healthy community public arguments about "violated principles" wouldn't be a frequent occurrence and wouldn't lead to atomization of projects. I'm not taking sides on this particular example (mostly because I can't be bothered to look up the drama). But I am saying that besides the confusion and negativity caused by seeing open source developers constantly bicker about their violated principles, it can be a major setback for the perception of reliability of open source software overall. For an app you install that mostly works no matter what it's one thing, but if you integrate a piece of software into a workflow and it suddenly spawns two different pieces of software with different splinters of the original team that can be a significant disruption and if you fear significant disruptions you may hesitate to rely on that particular thing in the first place.
So do I think there shouldn't be a right to fork? Not at all. That's the whole point of open source.
Do I think it's overall a negative for the open source ecosystem that major projects break up due to their contributors being unable to come to a decision about the direction of the project? Absolutely.