I think that when he means "boring", it's something that is relatively mature and the pitfalls are well-known. Despite C/C++ being (in my own opinion) dangerous

I think that when he means "boring", it's something that is relatively mature and the pitfalls are well-known. Despite C/C++ being (in my own opinion) dangerous to use and relatively hard-to-maintain, you already know where are the failure points etc. While Rust and Go (for example) are now a bit more mature, there are still some unknowns and (solvable) limitations (for example compilers in non-ARM embedded systems).