It's confusing because a few comments up is "for the vast majority of people single core performance is all they care about, it's also cheaper" which is unrelated to ECC.

I think it's coherent -- it's an argument for why most people don't want to buy Workstation class products just to get ECC. (Prices scale with core count. Not linearly, but still.)

Why ? If your device is a thin client for web services/gaming the risk of bitflips/bad ram is a minor annoyance.

I disagree with your handwaving bitflips away as a minor annoyance. Consumers don't love software crashing, even if they don't have any data they care about.

Imagine ECC was free -- would you rather have free ECC and no bitflips, or no ECC and bitflips? It's hard to imagine choosing bitflips.

ECC would save an unbelievable amount of labor. A shocking number of people have jobs looking at various logs.