I've seen theories that it's more related to how, at least aerospace graduates, appear to have much less practical experience at least passed as theoretical knowledge, and churn out designs that might be generally good when assembled, be possible to assemble... but totally impossible to maintain. Things like too small tolerances on pretty much everything, having to disassemble huge portions of an aircraft because there was no maintenance hatch of appropriate size, etc.

In a way, F-35 (but also recent F-16) suffer from related issues, where the complexity of maintenance is staggering, and the tools you're given to help manage that suck too much.