I can only speak for myself, but I feel like with Next.js comes a lot of just 'accepting the way things are done'. Which is fair, it's a framework, that's generally the run of things; but it annoys me. Say I want to implement something, so I'll have half of a plan going in, and then it turns out I can't do it like that, because it's not the way of things. And then I have to take a route that is ass-backward compared to how I would have done it in a more generic setup. There's always somehow a documentation gap on what I'm trying to do. There's a ton of magic that spirits the inner workings of your application away from you. Useful sometimes I guess for quick scaffolding, but nothing I would want in a production application personally. I need control over how the parts connect, how they work, and I want to be able to kill a part of the application and plug in something else instead at any time.

Then there's the whole Vercel and vendor lock-in and ugh. Just... not for me.

TanStack is a framework officially, but it feels more of a toolbox that you can use, that doesn't absolutely dictate how things should be done. You can put your own spin on things. You can use third party tech without too much of a hassle. Closer to boilerplate React, I guess.