If only iOS didn't gatekeep some of its most useful functions, that would be great.

Apple has been gate keeping for decades. It's a fundamental part of their business strategy.

Anyone still expecting anything different is ignoring reality.

It's really not complicated. If you want to continue to be gate kept, use their products and keep giving them your money. If you don't want to be involved with their shady practices, stop giving them your money and using their products.

What functionalities are limited on iOS? I'm curious, because I'm considering Pebble watch as I'm disappointed with Garmin.

Migicovsky wrote an article on it:

https://ericmigi.com/blog/apple-restricts-pebble-from-being-...

That said, I'm happy with my Pebble on iPhone (though I'd be happier if it had fuller access).

Now with Pebble you only receive iOS notifications.

Soon in Europe you can reply to notifications via voice.