I have run most of my PCs "flat out" for the first couple of years of owning them and all of those I still have were still working the last time I had to use them. RAM-wise, the only RAM failures I have personally seen were bad DIMMs out-of-box, some of which low reproduction rate single-bit errors that can take hours to show up on memtest86+. I'd wager that most "developing errors" you speak of could have been caught with a 48h memtest86+ burn-in after purchase.Talking about consumer CPUs? That's largely because they don't run flat-out as much or as hard as people run their GPUs. You're focused on the wrong problem.
And RAM does definitely develop errors at a higher rate than CPUs fail.