You bring out some fair points. And i'll give these maps a whirl myself to see if it is local or universal.
With regard to vossenack, the map was not even touched between the last updates. For work on Commander AI or attack logic, Gavrant is moving quite systematically through each map to make it better.
So any lack of use of tanks is an eventuality. As I recall, bots may spawn and bring up the odd Panther and a halftruck to help them cap the church, and although I'd admit, I haven't seen this recently, I can't think of any development work that would change that.
But I will push for this, as I feel Vossenack is a beautiful late war map that could use more love.