As a daily Apple user.
My biggest gripe I agree with is absolutely the Calendar syncing, Accounts, and the “back” button/swipes. I don’t know how many times I’ve had issues trying to sync and modify my calendar between personal and work schedules. It’s insane
As for the “it just works”. I’d say that’s strictly the case if you’re fully adapted into Apples walled garden. The connectivity between their devices has always been flawless in my use. Even my HomeKit devices. Maybe I’m just lucky, but connecting new devices just works and I usually never have issues afterwards.
Now I haven’t used Android/ google devices in a few years, so maybe it’s changed. But I don’t know how many times I’ve had to reconnect or completely re-setup Google devices and smart home devices on Android. But I do miss the freedom to customize the device how I want.