It also breaks a lot of disability features, like text to speech (in many instances) or navigation using keyboard keys instead of a cursor.
On the plus side, not having to reload a new page for each click can have some interesting benefits. These systems remind me of flash content, except they are perhaps less terrifying and intrusive.
The only reason I have yet to move fully to Android is because right now, Android without Google is such a neutered experience that I don't see any reason to try.
I only have an iPhone because of Apple's privacy stance. I hate every other element of the company.