I’m going by the iOS version of this, so it may be different.

It’s unacceptable because the competition (ie, the iphone) provides updates on a regular and timely schedule.

this is still better than HTC a few years ago when I had my DNA phone. They were legit withholding updates to try and get you to upgrade the phone instead. When I inquired about it with them and Verizon, both were blaming the other.