> why would you want to snooze an email?

I use my Gmail inbox as sort of a todo list. If a conversation is in my Inbox, it needs attention from me - I need to do some work related to it, reply to it, forward it, etc. Once I'm done with an email thread, I immediately archive it.

If you use this workflow (many do), snoozing an email is useful. I use it primarily for threads where I'm not able to reply and provide information immediately (so removing it from my inbox until I can reduces distraction), and for threads where I'd like to follow-up in a few days, if for example I don't get a reply.