If you are just using it exactly as you say, then it should work fine.
The issue comes when people see just how much else CAN be done, with the correct hardware, and try to extend beyond.
Like I originally said for WAN access, it's purely for third party addons or optional services. Granted, Community Applications plugin is getting closer and closer to being built in, but it's still third party for now. Any communication out of the box is purely optional based on what functionality you want to enable.
Trial mode is the only exception for the core product.
Set your 2TB as array disk1, and your SSD as a single member pool. All your system files and container applications should be on the SSD, all your bulk storage on the HDD. You didn't mention what your actual use case is, so it's possible you may want some files to first temporarily go to the SSD and be moved to the HDD later, that's managed by the share settings and the mover schedule.