its a different relationship entirely. you're hiring someone to mentor grad students, get grants, and teach. and while you aren't given tenure right away, that's certainly the goal, which can be a multi-decade commitment. everyone is trying to raise the bar with their program, and a couple 'meh' hires can really change that trajectory for quite a while. there are only like 20 faculty in your department, its not like development a giant tech co where there are tens of thousands and they are constantly moving in and out - each of these hires has a dramatic impact on your culture.

so yes, it absolutely makes sense to leave slots empty if you don't find candidates that you're excited about.