Stop using timezones? So every day would actually be two weekdays because at some random point in time it would switch date during the day. Let’s meet next Monday wouldn’t even specify a single day anymore in most countries. And there is no real benefit to stop using timezones, just downsides. Yes you’d know which time it is anywhere but you still wouldn’t know of they are awake or not and have to either look it up or remember it - the same you have to do now.