X restricts Y from being awesome.
Apple also restricts me from being awesome because they didn't give me a million dollar.
I get what the message is and I think I agree with Pebble on the iPhone being more closed off, but putting the blame on some outside thing for yourself not being awesome just feels immature.
It's just as easy to turn it around: by developing the iPhone in the first place and getting it in the hands of a lot of people, Apple makes it possible for Pebble to be at least close to awesome.