Tailwind config is optional now (still works with one! less stuff = less maintenance, good thing)
React Router's API did not change between v6 and v7, just added alternatives (i'm still using the v5 api on v7 lmao)
React itself has a truly absurd, obsessive level of back compat. Next.js does as well. Never had issues with apps of almost any size when bumping those deps.
Even more "bleeding edge" tools like React Query and tRPC usually provide code mods when they make meaningful changes to their APIs.
This is such a non-issue - the ONLY "victim" is people who make tutorials and educational materials. Net win for everyone else.