Do you have blast doors installed home?

Anyway, not sure how exactly ECC relates to security. Is there any specific attack vector where it helps?

A blast door protects against explosions – a very unlikely scenario, that will happen to practically nobody. ECC protects against bit flips in RAM which happen significantly often ( https://www.cnet.com/news/google-computer-memory-flakier-tha... )

Your comparison is inadequate.

rowhammer, though it apparently can work around ecc.