Concerning mandatory updates (back on topic)
This is just a guess, so feel free to dispute, but, IMO the mandatory updates are a ploy to disguise your bandwidth being used to phone home to Microsoft with your data. As we all know Microsoft is extracting data from our computers. This extraction of data can be monitored by the bandwidth usage.... being that Microsoft uses our bandwidth for data transfer.
If we were able to turn off updates, then the bandwidth usage/per month would give us a better idea as to how many times Microsoft is extracting data from our computers. The mandatory updates (including P2P) provides Microsoft with a way to hide the reason for bandwidth usages that we experience by extracting data from our computers during the update process.
Just my opinion, again, feel free to disagree.