And in the specific case of cryptographically secure code, you may well need to be paying attention to extremely low level details like the number of instructio

And in the specific case of cryptographically secure code, you may well need to be paying attention to extremely low level details like the number of instructions being executed on different branches, the states of various buffers and caches, etc. It may well be that it doesn't make sense to expose control over these things to the high level layer where it's irrelevant 99% of the time.