As I said, you missed the point. You recommended an OM-2. Those came out not long after the OM-1. It isn't about which is more likely to fail, it's about which one can be fixed if it does. If an OM-2's electronics fail, the camera's done, unless a donor camera can be raided, and the replacement's lifespan will still be a question mark. If a spring breaks inside an OM-1 (or an OM-2 for that matter), a new one can be made from spring wire. Gears and levers can be made, easier than you may realize. No one's likely to be fabbing a microprocessor.
It's not about sentimentality over functionality for me. I have several electronic cameras, of different makes, in 35mm and 645. They offer some great capabilities, even to someone like me, who almost never uses AE or AF. But if I had to choose one camera to take into the middle of nowhere, it would be a fully mechanical one like my MX.
After all, both mechanical and electronic cameras have lots of mechanical parts, so mechanical failure can afflict either. Shutter parts on either are more likely to fail than slow speed gear trains. But if the electronics go, I lose all speeds but one and no way to repair it, except with my LX, which would give speeds at X-sync and higher.