I was under the impression that the Soviets launched multiple identical missions to account for failure. In other words: rather than investing a huge effort into reducing the probability of failure of a singular mission, they invested in multiple missions in hopes that one would be successful. If that is the case, it sounds like the had much more confidence in the engineers who did the design work than their ability to do quality control while building.

Any how, it's meaningless to compare old Soviet products to new Western ones. The older Soviet ones are likely still in use due to an incentive to maintain and repair them. Old Western products were probably just as repairable, but there was less incentive to do so. As for new Western products, there are both technological and business reasons to ignore repairability.