I think the problem here is that these are mostly incremental improvements of things that were already around in 1977, at a fundamental technical level. It woul

I think the problem here is that these are mostly incremental improvements of things that were already around in 1977, at a fundamental technical level. It wouldn't be so hard to "invent" the transistor in 1900, for example. But the transistor, the thing that makes most of these gadgets possible, was already around in 1975, its only that people have gotten so damn good at making them by now. This happens through a long series of small improvements. Same would go for other tech... Not so difficult to build a battery or a steam engine in any age really, but making it highly efficient as we know it now, different story.