Why not support the company that actually supports the development of ZFS instead? I don't know anything about Qnap but FreeNAS has a wealth of robust functionality. I'd be curious as to why people would prefer Qnap?
Well if they actually does anything consumer like Synology and Qnap, ASUStor or TerraMaster I would have bought one immediately. But iXysystem hasn't done it for the past 10 years.
Hadn't heard of their new OS - interesting.
Ive always wanted Synology to license their OS out as their hardware is all low power stuff and useless for virtualisation.
Xpenology[0] may fit your needs. I'm not sure where in the grey area it fits, but it seems to get mentioned in polite company without inviting floods of copyright issues
That Xpenology exists may explain why Synology don't license their OS.