You need to remember that the technical people may not have an issue with it, but the bean counters tend to be more stuffy and upright about shit. And a lot of clients are especially up tight in my experience. Something about paying you money and expecting standard business responses.
I wouldn't give a shit if I saw that, but I absolutely would not send that up the chain if a junior sent me that screenshot (or I'd crop it down to the most useful info. Last thing I want to do is listen to some asshole c-level complain at me for 20 minutes about professionalism.
For proper ordering for one. ISO8601 is objectively the best way to label anything that might need to be ordered based on time. This forces data points to line up properly in chronological order, and makes it easy to time slice as needed.
Because it's the only one that goes from largest value to smallest. It's first because you start from the largest as the base (year) and work down through size to seconds.
Agreed. And any sort of data analysis would be so much harder