One could argue that every application which would benefit from OSR is essentially a micro benchmark. I can't disagree with that, because that statement is abs

One could argue that every application which would benefit from OSR is essentially a micro benchmark. I can't disagree with that, because that statement is absolutely true. The only difference between those two kinds of programs is the intention of the programmer. In both cases you have at least one heavy function which is called just once. As far as the VM is concerned, there is no difference whatsoever. But it's also true that there are sometimes long running functions which are aren't frequently called. In Java, JavaScript, or C# you won't have to worry about that kind of thing. You won't have to break it down in smaller pieces just for the sake of spreading the load across more function calls.