I wish Apple would make their watch work with Android phones, similar to how they made iPods work with Windows computers way back when.
Right now you cannot even set up a new Watch device without an iPhone.
The only thing I'd miss dropping to a watch + decent point-n-shoot instead of an iPhone is live photos, which are maybe the most important feature to me from the iOS ecosystem released in the last, oh, decade. Only reason I'd even hesitate to go watch-only.
Right now the Apple Watch is the only thing keeping me from switching away from the iPhone.
If I could pair an Apple Watch with the Razer Phone 2, I would be so happy and never look back. And the problem will only get worse the next 5 years as folding screens come out for the very high end market.