Swift Playgrounds building apps on iOS 15 is a big deal.
Widgets and multitasking in iPadOS 15 are a big deal.
System-wide Notes is a big deal.
Shortcuts on the Mac is a big deal.
The Health enhancements on the iPhone are a big deal.
Beyond this, I think that this year is a tuneup year for all platforms. Hopefully, tightening up code and making things more bulletproof.
iPadOS needs the most shoring up in terms of living up to the potential of the M1, which I did not see, this is my only letdown. Everyone with high expectations of hardware should have tempered them with the reality of supply constraints.
I know that there are Pros who need a larger iMac and MacBook Pros, but a lot of people here seemingly just want to be able to brag about things they aren’t going to buy anyways and are mad that didn’t happen.