I agree that a good JIT and the JVM is very powerful, but it's not a silver bullet that magically works for all systems. For example, JIT-compiled code can beco

I agree that a good JIT and the JVM is very powerful, but it's not a silver bullet that magically works for all systems. For example, JIT-compiled code can become uncompiled and recompiled all the time in the same process, resulting in weird performance characteristics. You can definitely fine tune and code in ways that prevent this, and for many apps it won't matter, but when it does matter it's a pain in the butt.