This is a position paper that I originally circulated inside the firmware community at X. I've gotten requests for a public link, so I've cleaned it up and posted it here. This is, obviously, my personal opinion. Please read the whole thing before sending me angry emails.
tl;dr: C/C++ have enough design flaws, and the alternative tools are in good enough shape, that I do not recommend using C/C++ for new development except in extenuating circumstances. In situations where you actually need the power of C/C++, use Rust instead. In other situations, you shouldn't have been using C/C++ anyway — use nearly anything else.