ipad is used for just entertainment, like video,music and game. For such kind of activities, you don't need many keyboard input and complex action. What you need is just some quick clicks
For computer, it is used for key board activities, like writing documents in office and some professional software operation. For this kind of the activities, they have two kinds of the feathers
for ipad, normally we just need to put it in our hand and the screen will be horizontal. It is a big difference with laptop.