Be that as it may, they have provided a hardware target for other companies to beat - which they frequently have - and in doing so have helped drive development forward. I somehow doubt we'd have 720p phones by now, or plans for 2560x1600 tablets, if it weren't for Apple paving the initial steps and making a device that is relevant to one-up. Screen res isn't the only thing.
As much as I dislike their business practises, only a muppet would deny that their presence has accelerated the bringing of new and improved products to market.