From my own perspective:
- Console focus/stagnation in PC game technology as a prime reason for PC upgrade. The leap from Quake 2 (not Arena guys, Quake II) to Crysis took 10 years. We are year nine from the release of Crysis. Few improvements here and there but almost nothing worth discussing has changed.
- Dumbing down of OS. It's a chore to stay in Windows world. Support for Windows 7 was discontinued too quickly, Windows 8 was unbearable, Windows 10 is just a compromise but with very unclear horizon.
- Graphics costing 2,3 times more than the entire PC hardware. Cards are no longer discounted when next generation comes out. My PC version of 750Ti I use in Mac costs about £10-15 less than the day it was launched. Two years ago. Considering fluctuation of US to EUR to GBP, it was discounted by.. well.. nothing at all, it's actually slightly more expensive?