I'm totally guessing here, but apart from just being able to trust professional design and manufacturing more, could there be some kind of a "nobody ever got fi

I'm totally guessing here, but apart from just being able to trust professional design and manufacturing more, could there be some kind of a "nobody ever got fired for buying IBM" effect there? If it were socially normal and expected to try and repair things, and you did happen to blunder, that would be a normal blunder that everybody makes. But if you go against the grain and try to fix things yourself when it's becoming less and less expected to do that, that could make a mistake feel worse. Of course one might quite naturally just feel more responsible for a possible mistake when doing things oneself hands-on rather than when delegating things to someone else in any case. Not saying you should, but it'd be quite natural to.