Stark made the suit with no help. He doesn't need a specific suit because he has the skill to invent whatever he may need.
At this point, Peter can't make himself a suit like that, so if he is nothing without it, he can't respect the power it brings. But he isn't nothing without it, which is what Stark is trying to teach him: not to rely on power of others.
Because touch screens are cheap and put the onus of design onto the programmers of apps.