The installers for NAS devices only need if something changes in the NAS system or the system requirements of the Roon Server software changes (like the switch to the dotnet framework). But also if bugs are discovered or I see opportunities for improvements.
The installers never contained the actual Roon Server software. Instead the actual software is downloaded in the process of the installation. I actually chose to use the date as a “version number” to not confuse the NAS installer version with Roon Server’s version number.
So if the “date version number” indicates there has not been an update for quite a while, it is actually a good sign, because no severe issues (that are related to the installer) have occurred yet. 
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