To me a huge loss from that time is that you could still completely understand what your computer was doing and what the software running on it was. Bloat has solidly killed that possibility, you could not even understand all the code on your phone these days if you wanted to, let alone your desktop machine.
Sorry, got any sources to back up that claim? Smartphones are indeed complex but I highly doubt Windows phone has the same LOC as Windows 8 (despite them sharing the same core), same for iOS -> OSX
The download is certainly bigger for OSX Mavericks (5.3gb) vs iOS7 (750mb). OSX seems a lot more open in terms of understanding what's going on though.