A defer is just a dozen lines of code nowadays, if you really need it, but in most cases you don't if you're doing RAII
replyIt is still a bit amazing to me that it was significantly easier to do coroutines in Sigma 5 assembly and likely most any assembly than in C or C++. Two languages supposedly close to the machine.
replyI have seen a pure C/C++ implementation of coroutines (it used setjmp/longjmp, and memcpy to copy stacks in and out of the native arena). Not the most portable of constructions, but it worked absurdly well.
replyBeing able to write "async" code essentially in-line is a superpower.
Agree but nowhere as easy as what we did https://ciex-software.com/coroutines.html
replyIn embedded, I like wrapping a class around a set of registers. Nobody else gets to write to that piece of hardware except that class.
replyAs far as avoiding things... avoid basically everything you don't need. Don't add language features that don't actually help you, just because they're there. Keep the subset you use small. But pick that subset to match your problem well, rather than out of dogma.