Is there such a thing as a standard PC (actually, laptop) platform? Some manufacturers are better than others at repairability, but between two different laptop models, even from the same manufacturer, the only things likely to be interchangeable are the RAM and the storage. The OLPC had repairability designed into it, but on the assumption that there'd be a large enough deployment of them in any given area, and you'd scavenge broken ones for parts.

I honestly don't think that it would have been much different in this respect had the OLPC been a single model of a consumer-grade laptop - parts would have been scavenged from broken ones. Except perhaps that consumer-grade laptops weren't designed for the conditions the OLPC was designed for, so would probably have failed more often.