I don't think it's useful for everyone but the military and people who grok log files.
Knowing that 6am is early is good, imagine how confused you'd be if you travel overseas but the timezone is always the same, you'd have to re-learn what time the morning is etc and constantly try adapt if to your situation.
The current local systems we use have function we take for granted..
I just have a UTC clock on all my devices (along side my local time) and I find that's the most useful. Local time is what I use primarily, UTC for international calls.
Knowing that 6am is early is good, imagine how confused you'd be if you travel overseas but the timezone is always the same, you'd have to re-learn what time the morning is etc and constantly try adapt if to your situation.
The current local systems we use have function we take for granted..
I just have a UTC clock on all my devices (along side my local time) and I find that's the most useful. Local time is what I use primarily, UTC for international calls.