I would highly recommend just checking out TanStack Router/Start instead. It fills a different niche, with a slightly different approach, that the Next.js app router just hasn't prioritized enabling anymore.
What app router has become has its ideal uses, but if you explicitly preferred the DX of the pages router, you might enjoy TanStack Router/Start even more.
Tanstack anything has breaking changes constantly and they all exist in perpetual alpha states. It also has jumped on the rsc train with the same complexity pitfalls.
Some libs in the stack are great but they were made pre rsc fad.
If you're using an alpha library then that's on you for not expecting breaking changes. They have plenty of 1.0+ libraries that do not receive any breaking changes between major releases and have remained stable for well over a year.
Also, you're just wrong? You literally cannot serve RSC components _at all_ even in TanStack Start yet. Even when support for them is added it will be opt-in for only certain kinds of RPC functions and they will work slightly differently than they do in Next.js app router(where they are the default everywhere). RPC != RSC.
Plus you can always stick to using TanStack Router exclusively (zero server at all) and you never will even have to worry about anything to do with RSCs...
What app router has become has its ideal uses, but if you explicitly preferred the DX of the pages router, you might enjoy TanStack Router/Start even more.