It comes across as really uncaring to the probably 99.9999% of people outside of the US who have no idea offhand what UTC offset it is, it almost feels hostile.
If they at least included “(UTC -7)” after PDT, while still a bit annoying, at least people could work out what time that is without having to lookup PDT from somewhere first (as I just had to).
Shrug. They're big enough to set a standard (much as we have GMT because France and the UK had enough political / economic / cultural gravity in the era of the steamboat to make the world care what a "Greenwich" was).
We just keep a clock on the wall set to Google time, like they do in newsrooms and NASA mission control. It's convenient enough.