Say anything negative you could possibly say about Next ... and it will apply a thousandfold to Gatsby.

Likewise React Router is ... the example I use when I want to tell someone about a terribly engineered library. As you said, there are multiple React Routers, because the developer is completely incompetent, and has no idea what he is doing. As a result, he changes the entire library in massive, backwards-incompatible ways ... EVERY. NEW. VERSION.

Astro and Remix are viable options, but there's a reason why Next (despite it's flaws) remains dominant over them.