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...