Since it's been brought up by the other thread, I'll leave a note here about revising the current FFS discard
(ATA TRIM) implementation.
The second suggestion is bringing zfs(8) in par with current OpenZFS, thus to reflect the changes upstreamed by ZoL and prevent incompatibilities with FreeBSD, Linux and illumos.
I'm not particularly interested in or concerned about those features, but I'm confident a good portion of the userbase is, at least very least those using (or evaluating the possibility of using) the OS in a professional environment, as well as those enthusiasts who'd pick out NetBSD for storage/database operations.