The problem is devices that WOULD be significantly cheaper to repair if parts were more easily (and reasonably) available and if the things weren't designed to be harder to repair.
I keep hearing this complaint - that there are devices out there which are "designed to be harder to repair" - but, at least in my experience, that's incredibly rare. More often devices are designed to be difficult to open due to concerns about warranty claims on modified items, and even THAT is pretty rare. Every electronic gizmo which I currently own can be opened with relative ease. Most of them I would be able to perform SOME repairs on, as long as it doesn't involve having to replace chips or capacitors.
There are some things that bug me - such as my Nexus 5 not having a (easily) replaceable battery. However, while I may not be happy about them, they're all design choices which the manufacturer made for reasons that have nothing to do with repairability. And, for the most part, they're things that don't really effect me (eg. it is highly unlikely that I will keep my Nexus 5 long enough to actually need a battery replacement).