disagree - good products meet their users where they are and bury complexity under the hood. i can't imagine trying to use a calendar app (or any app really) that refuses to operate in any mode other than UTC.
OK but most people would agree that "only UTC" is not an ergonomic default. There is a balance.
Also, are the users where they are because they want to be there, or because long ago some government or religious leader forced something through and they go along with it because of some kind of inertia?