I see flash drives and SD cards as just more planned obsolesence in our consumerist society.
Yeah they have their advantages for fast boot times, and gaming, but they cannot be trusted to hold anything very long. Plus with repeated usage, and normal filesystem journalling, they can degrade pretty damn fast.
HD drives maybe slow but they are at least designed to hold data for a long time.
Im sure I will swap out my system flash drive in other year or two when it seizes.