Performance is a skill, probably one of the most important skills.
Rust is a darn language, not a skill. You can have performant code in rust and in c++ and damnit even in brainfuck if you care enough.
But the reality is that there is more performance oriented code written in C++ than in rust, and that matters.
Neither Javascript shall be needed to see anything on the Web - if not being essential for tracking and ads - but it's you who have to pay for it with that threadrippers (and no access to source data) ? Yes, it happend people are rich enough to belive that.
Making things simple and possible is the most important skill.
