It no longer matters. i just got a G2 a couple weeks ago and i like the UI even better than the one in Lollipop. First time i ever got the comfort of my old skeuomorphic UI back (even the Notes app reminds me of my old iPhone before iOS 7 ruined it) and i no longer need the updated Android. First time in years i can actually navigate the UI without remembering all of Google's gestures, use the stock apps in place of Google's, and can stand the look of the interface. i have to be 100% happy with my devices, and this includes not only stability and performance, but the UI has to be something i can enjoy looking at. so the issue regarding delayed updates, for me at least, is now moot. the G3 is kept as a spare, but i have found no way to put the G2 UI on the G3. i wish i could, as that QHD display would really pop with it. About the most i could get on the G3 was the homescreen launcher theme, using some third party launcher and a G2 icon pack and an XWidget that copied the older Optimus Weather widget, but i couldn't theme the settings menu or the apps themselves so they kept either the partial Material Design (which isn't that bad because it's not flat, but it's not fully there as some things only work in Lollipop) or kept the usual flat design spin (stock LG apps, notification drawer toggles, etc) and since a recent update made my phone unrootable, i can't work around that with root.
