We do not want anti-features preventing us from using our device as we see fit (e.g., updating on our own).

I don't think this subscription service is the thing that prevents you from doing that?

No, but the proprietary nature of the software, with updates that I can't control, might be.

Then make your own device. Nobody out a gun to your head saying you have to buy this device.

I was asking whether this device fits my demands.

So you want to buy a fridge, and keep using it without paying for it?