Most consumers use their devices for media consumption, games, and surfing the web. ALL of these are heavily multi-threaded. Yes, even dear old Javascript is parsed and compiled in multiple threads, concurrently GC'd and uses web workers, service workers, and webassembly.

In the business world, all the commonly-used software I can think of is heavily threaded as well. Generally, the remaining software that comes to mind is simple stuff that could run on a decade-old machine without too much trouble.

What typical programs are you running that require so much single-threaded performance?