It's honestly been a nightmare, and I wish I had just built in Django instead. The Tailwind 3 -> 4 migration was probably among the most painful, which I was not expecting.
When you have something like SDL which is at it's third version at 27 years old, I'm very doubtful about the culture of NPM/JS world. A closer example is jQuery which is also in its third version at 18 years old.
It's a constantly improving and experimental domain - not just on the web but also the desktop and mobile environment.
Next.js is a good example since it (and its competitors) are a natural iteration on top of SPAs where you want the first request to the server to also inline the initial state of the SPA to remove the double-request problem.
But you pay a huge price trying to live on the edge like that, and when you run into issues, it doesn't make much sense to call that the state of web development since you could have used boring server tech or even a boring React SPA which also hasn't changed much in a decade.
Eslint 8 → 9 was not just incredibly painful with a shock wave that still propagates through the industry, but it was also totally useless