I wouldn't call TrueNAS, or anything where you're installing an OS on custom hardware, "turn-key". That's saved for the Synologys and UGREENs and Ubiquitis of the world.
You can purchase TrueNAS hardware + Software pre-configured. It is not clear what the individual you were responding to was doing, but I have personally experienced many off the shelf, supposedly ready to go IT solutions that require as much tweaking and admin time as a custom solution. But different folks have different skill sets, too.
The problem with Synology type NAS is that they still treat you like a product. If you go this way, you have to accept the limitations. Or you have to do everything yourself.
