[sershe]

I think the idea behind such high level APIs is that they work well enough and are easier to use in 9X% of the cases and you can still get perf out of them if you look under the hood.

For the reverse of your example, consider Java and .NET GCs. Most people don't need to tune Java GC and can just copy some config off stack overflow, however Java GC (GC-s, actually) tuning for perf and reading its verbose log is a whole dark art and there are tons of really long and verbose articles and example stories online. .NET GC is much more opaque in my experience, and that is really annoying when it doesn't "just work".

async await makes writing async code stupid easy most of the time... much easier than in Java, although I haven't used Java in a few years, it could have improved. However when it doesn't quite work you need to look under the hood.