If you're running a 12th-gen Intel processor, there are some optimizations in the thread schedule to eake out more performance by appropriately scheduling the "efficiency" and "performance" cores.
Note: If you're on an AMD Ryzen-based system, the new scheduler ain't great.
Seriously though, while I like new tech, with Microsoft OSes, prefer to wait AT LEAST two major quarterly patches BEFORE I'll even consider putting it on anything other than a VM. If I'm not due for a major OS reload, I can wait quite a while.
There's, quite literally NOTHING in Win11 that's "must have" outside of the aforementioned 12th Gen + Scheduler stuff.