Comment by cogman10

> But IC1-3s write 99% of software, and the 1 QA guy in 99% of tech companies

I'd take this one step further, 99% of the software written isn't being done with performance in mind. Even here in HN, you'll find people that advocate for poor performance because even considering performance has become a faux pas.

That means you L4/5 and beyond engineers are fairly unlikely to have any sort of sense when it comes to performance. Businesses do not prioritize efficient software until their current hardware is incapable of running their current software (and even then, they'll prefer to buy more hardware is possible.)