I think the very real limitations of the iPad may have more to do with it's sales decline than anything else. Looks good but leaves you wanting because it was dumbed down too far.
Einstein is often quoted as saying "Make it as simple as possible". However there's more to it than that, the full quote in one form: "Make it as simple as possible but not simpler". When you leave off the last part you may end up making it "Simpler" which isn't what they brainy guys advice was. We see examples of both often, some things are over simplified while others are overly complex for no reason. You don't have to be a genius to get the right balance but it might help.