I don’t think the common question is “Why not use Chrome instead of Safari?” but “Why use Safari?”

I have colleagues who are annoyed that I use Firefox because in their world everything Chrome does is standard and browsers like Safari and Firefox are annoying outliers. No matter if something they have implemented in Chrome is _actually_ standard and no matter how proper to the spec non-Chrome browsers implement a feature they see it as a chore to support the spec rather than the Chrome browser.

So, the "Why not use Chrome instead of Safari?” certainly happens.

Battery life.