They may. One of the promises of the compiler though is that you don't need to change how you write your code. It will determine how to run.

That promise doesn't really make sense to me - although partial compilation will likely ameliorate most migraiton pain for library dependencies if they come pre-compiled with the compiler.

Code written with the react compiler in mind will inevitably be MUCH slower without the compiler, as its not going to manually add any memoization. Likely to the point where its not going to be usable without it.