I'm skeptical. I've seen too many developers write poorly performing code purely out of indifference. If you gave them more time they'd have a lot more Reddit karma but I'd still be finding N+1 problems in every other code review.
You'd say that code reviews is where this stuff should be caught, but unfortunately, code reviews are performative in most cases or the reviewers also don't know / care about these details either.
Imagine a really good Angular dev who’s been using it for 7+ years. Sure, their code might be fast, but everything’s moving to React now.
Even backend languages change quite a bit. .NET Core is a big winner in performance compared to .NET Framework, but you can still write lousy-performing code in it.
From an architecture perspective, people seem to have a hard-on for serverless lately. Which typically involves considerably more HTTP requests, which causes performance issues. On a simple test system things are fast enough, but once you scale the latency starts to add up.