I think what you wrote largely applies to Java and especially JavaScript, much less to C#. Value types, real generics, and native stack allow even the faster version of the .NET JIT to produce native code that’s not too horrible performance wise.

Good enough for desktop or embedded use cases, even on slow CPUs. I have 3 such devices on my desk, Raspberry Pi 4, a dev.board with Rockchip RK3288, and a tablet with Atom Z3735G, .NET is reasonably fast on all of them, without noticeable warmup issues at startup.