Case in point: Europe abolished DST absolutely fine to decrease complexity.
But this is not a technical concern. This is a human concern.
Reality is watching one dude in Australia meet his friend an hour early by accident because they couldn't even work it out with local domain knowledge. This happens all the time. The amount of Zoom meetings I get into because no one can work it out or they had their Outlook set up in the wrong time zone because they were travelling is insane.
The only viable solution to these issues is a common, unified zone for scheduling which probably should leverage UTC.