[LnxPrgr3]

This is true. Compilers even sometimes act vaguely like JIT—see also speculative devirtualization. If your code really needs runtime profiling information to optimize well, we have profile-guided optimization too.

In theory your could still benefit from JIT if, say, you have a Java application that's half written in XML config files and always heavily customized for each deployment. But probably that application also needs 8 modern cores and 16GB RAM to start for reasons that aren't even Java's fault.

But I try not to write code like that.