Separately, the process of installing apps that are outside a system app store and aren't verified has also changed, but this is not required by the developer verification feature, and the result seems like a wash to me. The first time you enable installing apps from other sources is harder, but this setting then persists across device upgrades, so the subsequent times go away completely. This now requires developer mode, but apps that check developer mode (I haven't found any in the US) can be mollified with a Tasker task to disable developer mode when launching those apps and enable it again after.