If you don’t like a new tool, don’t use it. I can’t stand this kind of meritless complaints. If you’ve got a problem with the implementation of a new tool, that’s understandable. But to take issue with its existence? That’s just petty and a waste of everyone’s time.
If it takes away from their community and momentum, then yes.
Attention in FOSS is close to a zero-sum game.
Not to mention when the devs themselves get bored with tool X they've created and jump to creating some newer tool Y, dropping the whole community...
Given that you don’t pay for the product I don’t see anything wrong here. People work on what they want then change if they’re bored; you can’t do anything about that but pay them to continue supporting the tool you decided to use.
In my experience, what is more common is that people who would otherwise not contribute to an existing project for whatever reasons (e.g. complexity, bad experience w/ maintainer, etc) start contributing to a new project because these younger projects are generally more approachable.
People don't really jump ship from something they've invested time into unless it's very clear that something else is taking over.
Change != !Improvement
So I'm not seeing the point here.