I really wish it could do USB passthrough. I need that for home automation to run in a VM under TrueNAS. The solution I've been running for a few years now is to have TrueNAS and Home Assistant running under VMWare ESX. Required getting an HBA that I could pass through to the VM instead of using the ports on the mobo but it works nicely.
Having Home Assistant as a guest under TrueNAS would be nicer though. Right now there's no data redundancy for Home Assistant.
I'm looking forward to TrueNAS SCALE[1], which is basically TrueNAS on top of Debian instead of FreeBSD.
Mainly because then my containers can run on the metal rather than being limited by Bhyve.
Currently in Alpha. I fired it up in a VM and it had some rough edges still but did manage to create a pool and fire up some containers.
Been running FreeNAS, now TrueNAS, for several years and been happy with that, but not being able to take full advantage of the hardware due to Bhyve has been a pain point.
Having Home Assistant as a guest under TrueNAS would be nicer though. Right now there's no data redundancy for Home Assistant.