Well, that's the thing. I've also found some posts saying it's a myth and you'd be fine, but the ratio of posts recommending ECC to posts debunking the myth is like 10:1.

The important key point is that you will not lose anything by using ZFS without ECC compared to using any other file system without ECC. The myth is that you specifically need ECC if you’ll be using ZFS, not that ECC is a really good idea for any file system.

https://jrs-s.net/2015/02/03/will-zfs-and-non-ecc-ram-kill-y...