Look at it from the perspective of 1977 or just before, when the scripts were written. I wasn't alive back then, but from what you read, it was a time when (real-world) devices came with manuals, schematics, block diagrams, and if they were missing you could probably find them or get them from the manufacturer.

Apple I and II are just hitting the market, with a strong background in DIY culture, and in the unlikely case you had access to one of these (or something like an Altair 8800 etc), you'd probably know how to fix a blown cap with a soldering iron.

Maybe I'm glorifying the past here but, Star Wars was written at a time when things, including computers, were expected to be repairable. So what you're writing really only makes sense from a contemporary 2020-ies perspective, nobody would have raised an eyebrow at that detail in 1977 ... probably.