I guess most folks do know the difference between their own local timezone and UTC. That would have really saved me a couple of seconds to find out the difference between PST and UTC first.
I'm sure you can find PST in a standard somewhere too, but the point is that by using UTC+x everyone can instantly determine their local time.
Okay quick quiz: What time is it currently in Europe/Zaporozhye? ... Time up! Alright next question. What time is it currently in UTC-3? ... Time up! Final question: What time is it currently in the GST timezone? ... Time up!
All of them used standard formats. Which one was the easiest?