iOS is keeping other keyboards from greatness – Katherine Boehret, The Verge
Boehret complains that third-party keyboards are unable to use dictation. But that's only one of the problems with third-party keyboards.
Support for third-party keyboards – and web browsers – is one area where Android is just plain better than iOS. iOS is always pushing you back to using the stock keyboard and browser. Android works more like a PC; if you change the default, you change it everywhere, throughout all applications and the operating system, which is as it should be.