I don't see myself ever using anything other than Laravel, but love these kinds of projects just to see what new ideas they might spark for the wider PHP community. Also interested in https://tempestphp.com/
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In true JavaScript fashion, I decided to learn PHP again by building a framework to put all the pieces together in my brain.
I absolutely love Hono.dev, and decided to base the PHP framework on that. Dumbo isn't intended to compete with Laravel, Symphony or Slim, if anything, it's something people can use in production, but also contribute to and be used as a learning resource for others.
But if you're looking for something more modern and interesting, then Hyperf looks pretty cool. They have a mini-framework version you can check out: https://github.com/hyperf/nano
It does require Swoole, but that is a lot easier to get your hands on these days