That is exactly what I was thinking when reading the post about security updates.
I have used You Tube in my M11 Plus about once a year and very occasionally use Chrome on a Shanling to download updates.
I am no internet security expert but I would logically expect that this type of use would create very low vulnerability to security problems.
I would be most appreciative if someone who understands this stuff would offer some insight.
It is not that simple.
It is a complex and complicated topic. There is a chance that the lack of security updates never affects you, there is chance it does. Nobody can know the future and know what exactly you are doing.
Especially when you have an Windows PC, there could be malware on your PC that is doing nothing more than checking the network for vulnerable devices (that is something that actually happens, a _lot_). So having your device in the same network as an PC could already be enough. Maybe not. Depends on too many factors to answer.
If you don't do anything relevant on the DAP and there is nothing important, the worst that could happen is that the OS goes garbage. In the best case, a reset does the job. In the worst case, its a root exploit and your device is bricked. But that is very rare.
For example you don't use your Google Account on the Device, you don't use important credentials on any of the streaming services and there are no credit card informations or similar in the accounts of these services, than you can ignore it.
If you only playback local music files, it doesn't really matter. You're maybe hit by bugs that annoy you that are already solved but thats most likely the worst that happens.
If you connect it to the Internet to do streaming, it gets complicated due to a lot of reasons. Usually you have to pay for these streaming services which means, you have to connect an account with payment information. That is, where it gets complicated.
The best thing is to just not take the risk. Why would you not want updates? There is no reason to not want them. The only reason people say they don't need them and don't care is, because they can't have them. So if you have no choice anyway, you just give up and tell yourself "I don't need them" because the alternative would mean, don't buy that DAP. And if you wan't that DAP, there is nothing you can do.