My wife has an N4 running 5.0.1 with no issues re calling, so if there is an issue for these users it's an isolated one and not a systemic problem with all N4s.
Most of the Android phones on the page you linked are not Google phones. Whether or not they get updated is up to the manufacturers and carriers, not Google. You'll note that the Nexus phones have more update support in general.
Whether providing major updates to a phone is a good thing is debatable. My wife hated getting the 5.0 update. She saw it as a major inconvience that changed how her phone worked for no good reason. She would prefer to have the phone work the same way for the entire time she owns it.
PS: 'Sup, fury?