Re: Nexus NOT immune to this.
I wouldn't say it's been abandon ages ago.
According to the Nexus 7 (2012 edition)'s Wikipedia page the device is upgradable to 5.1.1 Lollipop and CyanogenMod is still providing updates for it. (granted not for Marshmallow but since it is still getting the nightly builds it's possible for it to get Marshmallow)