Sure, I would. Maybe a lot of people on this forum would. But we're 0.0001% of people that use light bulbs. Our personal persuasions are pretty irrelevant in context. And most of the time it doesn't make financial sense for us to do it, it is just personally satisfying.
The vast majority of people have no interest in repairing their own electronics, period. If it is cheap to replace, they will just get a new one. If it was a big investment, then it's important enough to call a professional to fix. In the middle ground you've got people who will ask their handy nephew to try to fix it before they run out to the store, and he'll open it up and look for a blown fuse or a loose wire before giving up. The type of people who can do board level repairs are so rare as to be completely irrelevant to the waste stream of electronics.
Even if we repaired 100% of broken electronics, we'd only make a tiny dent in the volume of waste electronics. Most electronics simply fall out use before they ever break.