That is your perspective of how to weigh it plus also questioning of why the user wants that functionality in the first place, which I am not going to argue since VLAN enabled with untag state is quite a common deployment scenario as opposed to being termed a particular high level problem.
The point is that is has been available with swconfig and there are plenty of TO users deploying it, e.g. this one DHCP on VLAN suddenly stopped working after energy loss (?) on 2 Omnias