It’s basically a statement to prepare for any issues now, while supply infrastructure is not under stress.

It’s good sense generally. However, the predictions for this winter mean some areas could have issues. The cyber attack on France also lit a fire that supply chains could be disrupted for days.

As someone who travels quite a bit, that would be hellish.

It provides a consistent reference for information sharing. E.g. you move to a new area of the world. Assuming a 9-5 work time is a reasonable baseline. Assuming a kids bedtime is 8pm is also reasonable, etc. Without timezones, you would have to relearn all of those.

You would also be required to memorise those details for friends and relatives who live abroad. E.g. if a friend moved from the UK to new Zealand, you just need to memorise the time offset. That way it becomes easier to catch them before work, or before bed, rather than in the middle of work, or while they are asleep.

Ultimately, both in parallel is likely the best option. Local time for local events, UTC for global level events or referencing.

We have that. It’s called UTC.

The problem is that time zones are convenient for most people. Most of the time you are only interested in local time, not global time. It’s rare to regularly have to coordinate across multiple time zones.