Portability is not really an aspect one needs to consider when it comes to a NAS

Hard disagree, and it is one of the best things about ZFS. You can plunk a ZFS pool on another system and be almost certain it will import. Systems die. Having been through several data-loss incidents, I find it is much preferable to be able to pull 1 disk than have to drag out 2 or three to transplant a ZFS pool.

Regarding the scrubs, I was trying to indicate that ZFS is more than just a raid manager, there are advantages to ZFS on even a single disk.

for a home NAS, the goal is maximising data storage capacity without a major hit on performance

If that were entirely true, striping would be the most popular ZFS pool arrangement, since you get performance and max storage.