it's just the definition of the word, right? You presumably hire someone with a set of responsibilities - some mix of write this software, design this UI, optim

it's just the definition of the word, right? You presumably hire someone with a set of responsibilities - some mix of write this software, design this UI, optimize this server and you're at some degree of freedom on the requirements. Set high bars in quality and speed, sure, but if someone meets those levels then that's adequate and why replace them?