Really? I thought the opposite was the case, that UIs don't use threads enough. For instance, the WhatsApp Windows desktop app often freezes while I'm trying to type a message, often losing much of what I type. It's not the only program that does. The part of the program that takes in keyboard input should never freeze because some other part of the program needs to load data somewhere else.
Maybe we're talking about different things, though.
Maybe we're talking about different things, though.