In the early 90s you had a few megabytes of ram, running out of ram was a normal thing so your programs had to handle it everywhere. That makes the kind of test

In the early 90s you had a few megabytes of ram, running out of ram was a normal thing so your programs had to handle it everywhere. That makes the kind of testing we do on modern computers useless, our tests only works if we don't have ram issues or other parts of the system fails. The fact that programs back then still worked quite reliably is a miracle. And then you look at today when hardware is super reliable, people have forgotten that running out of ram can lead to bugs etc, yet we still have plenty of strange bugs in software that never should have had any bugs in the first place. If people today learned systems and wrote things with the same care they did back then you wouldn't have all of those bugs. But instead shipping bugs is fine etc, we took all the advancements and used it to push features faster rather than make things reliable.