These aren't the tools of the 80s, they're the tools of the early 70s at best, probably closer to late 60s. The vast majority of technology used in NASA mission

These aren't the tools of the 80s, they're the tools of the early 70s at best, probably closer to late 60s. The vast majority of technology used in NASA missions has to have been used for about 10 years so that there is a detailed and verified data set about reliability. And then they over estimate. That's the reason why Voyager still works and why one of the first two Mars rovers is still chugging along, way past expected mission life (and the second one also died recently, way past mission life)