I think some people don’t give any room to breathe to projects that just want major contributors be paid, even when, as you rightfully say, XMPP had the same compatibility struggles in its infancy as Matrix implementations now have.
So far, there is a lot of FUD around newer protocol and that it lacks in openness. But if you look again, it recognizes versions and differences between them in the specification. Every MSC proposal covers the context of change and recommendations to implement, while keeping backwards-compatibility with older software in mind. If you make a proposal, it will be reviewed. If you need someone else besides Spec Core Team members to move it forward, flag to you - fork. But I rather prefer this model in upstream than beating around the bush and electing someone who might have lost an idea of why they are still in the project.
Pretty much same thing. I want niche creators to see that their content is appreciated (in lack of paid subscription), and Piped with a bunch of other frontends are simply not a way for this.