No need to keep it to yourself. As you've mentioned, all of these requirements are misinformation so you can ignore people who repeat them (or even better, tell them to stop spreading misinformation).

For those not in the know:

You don't need to use enterprise quality disks. There is nothing in the ZFS design that requires enterprise quality disks any more than any other file system. In fact, ZFS has saved my data through multiple consumer-grade HDD failures over the years thanks to raidz.

The 1 gig per TB figure is ONLY for when using the ZFS dedup feature, which the ZFS dedup feature is widely regarded as a bad idea except in VERY specific use cases. 99.9% of ZFS users should not and will not use dedup and therefore they do not need ridiculous piles of ram.

There is nothing in the design of ZFS any more dangerous to run without ECC than any other filesystem. ECC is a good idea regardless of filesystem but its certainly not a requirement.

And you don't need x5 disks of redundancy. It runs great and has benefits even on single-disk systems like laptops. Naturally, having parity drives is better in case a drive fails but on single disk systems you still benefit from the checksumming, snapshotting, boot environments, transparent compression, incremental zfs send/recv, and cross-platform native encryption.