This line of thinking is how we end up with nonsensical UX like having to select "America/Los Angeles" to get US Pacific time. There are many use cases for date

This line of thinking is how we end up with nonsensical UX like having to select "America/Los Angeles" to get US Pacific time. There are many use cases for datetimes and timezones, not all of them need a location and in some cases it's incorrect or misleading to include a location. You could certainly use a UTC timestamp and coordinates in your application but that doesn't work for many other use cases.