iPad users - could you envisage using a touch-based keyboard on Desktop or Laptop

I'm talking a full size virtual keyboard. I've met one person so far who thinks they can type as fast on an iPad as on a keyboard, but I'm not so sure. 

Remember that the iPad keyboard isn't full size either, and it would benefit speed typing if was consistently as big as say a MacBook Pro's keyboard. I think if it were usable, it would kind of be mindblowing.

Words, I love adding words.