I totally agree with you that in terms of design, Apple is the great innovator in this industry; it has, indeed, taken the design of both hardware and software into another level. I absolutely know the importance of design, not only in aesthetical terms, but especially in terms of making products more useful. And I have to agree that this approach made Apple release great consumer products and made it the biggest company in the world in terms of market cap.
Now, you have to agree that higher resolution displays are a matter of engineering. The industry itself was leaning towards it anyway. But, in terms of design, Apple did a brilliant job by managing to put a high resolution display in such a thin and light laptop (in terms of hardware) and in introducing a good scaling approach in OS X (in terms of software). And the marketing was good too, as the general public became aware of what a "retina display" means.
Now we're getting somewhere; agreements.
Yes, high-res displays were a long time coming. These high-res displays have been prototyped for a while now, but Apple took the initiative and pushed it to the mass market first, in which they already had a massive control in (thus allowing the adoption to be much quicker.) While other companies have been sitting and reaping rewards from older technologies and not taking the initiative.
Apple has made it clear that what matters more is user experience and not the fastest/most features available on a device, but obviously they're always ahead of the pack (in terms of speed and features) when it comes to releasing a new iOS device.
Glad we agree that we need more companies like Apple to push human communication more. I think education is probably one of the key areas that Apple needs to push more (along with other companies.)
There are millions of underprivileged and uneducated children (and adults) in the United States. The internet and a receiving device (such as an iPad) should be available to every household.