Fullscreen preview on secondary monitor

I think this feature exists in Premiere, but many Adobe programs, Photoshop, Illustrator, After Effects, etc, I wish had an option for a fullscreen preview on a second monitor.

Often when I'm working on a project, I'm using  a video display in a non-standard way, and being able to have an immediate real-time preview of what I'm doing is extremely helpful.

That's a niche reason, but why wouldn't everyone want the ability to have a full-screen preview while they work?