But I also do push-ups. See, it is rarely an either-or proposition. One could push vue.js to the limit and then decide to do a rewrite. But to take the rewrite option as the first available exit whilst explicitly referring to the original is fragmentation where I wonder if it is actually needed.

Well, it is either-or. All time spent has an opportunity cost. Just doesn't strike me as an argument. Nothing is needed, and need doesn't describe why most software exists.

These sorts of comments amount to judging how others spend their time. It's just as silly to me as me suggesting that you spend your time credentializing in React so you can improve it for free.

I'd say there's plenty of value to offer the world by creating alternative projects that stand on their own, experimenting with different approaches.

Well, we're going to have to disagree on that. I feel that a lot of the fragmentation in open source is due to the fact that it sounds good to be the maintainer of some project, the fact that github presence is now considered a factor in getting hired certainly contributes to that.

Fragmentation - without sufficient forethought - is not cost free and 'more wood behind fewer arrows' works both for commercial entities and for open source.

Most of these 'alternative projects that stand on their own' are announced with great fanfare and die a silent death a few months later, the same effort spent on improving what is already out there would go a much longer distance.

Obviously everybody is entirely free to spend their time in whatever way they want.