Resurgence of coding skills
As someone coming into computers in an era where we cared about every byte, and every cpu cycle, I hated the general philosophy of the last 15 years or so where "if it uses lots of memory, buy more memory! If it's slow, get a faster system! "
It was nice to see a 'back to basics' (pun not intended) with the rising popularity of smart-phones and embedded devices, but I'm beginning to see things getting worse again now that the power/capacity of these devices has greatly improved.