I don't like devices that sip on power when I'm not home, or asleep. It makes no sense at all. It's not like fetching emails involves connecting to a landline, ring up a dialing device, get... The mac boots faster than my ass gets in the chair. Stuff loads instantly. I turn off the whole desk at the wall at bed time, so all the "mood lights" go off as well. Simple, safe.
I get the convenience of always on, it's just not my jam.
Shutting down and starting up again can draw more power than sleeping/other low power mode. e.g. airplane mode on a phone is probably better than turning the device off for the night. Old dumb phones used to sip power when switched off so the alarm would work.
No idea with desktops, but I wouldn't be surprised if suspend used less power than stop/start for overnight in some cases.
I get the convenience of always on, it's just not my jam.