Everything about it verifiably worse than the separate apps Apple ships with macOS, from data storage to integration.
That said, MacOS 10.6 was the pinnacle of Calendar, and it's been on the way down since...
Edit: and if you're willing to use Safari on iOS, there are dozens of Safari plugins on the app store that provide good-enough adblocking.
(I agree though, since I don’t drive a semi or dump truck.)
Also, FWIW, they don't just pick between 18 gears with a single shifter. They have multiple inputs that allow shifting between multiple combinations of gears, some requiring clutch to change and some not, as they gain speed. Most trucks still only have 6-ish positions for the main gear shifter to slot in to.
Both things that have been done with non-connected cars for decades.