This call-in meta is partially our own doing. Back in the alpha/beta, all call-in units simply replaced existing buildable units or were added as new options. Mortar-HT was built from T2, Tiger from T4, IS-2 from T3, T-34/85 replaced T-34/76, etc.
But people wanted the doctrinal units to work like in CoH1, as call-ins, since it would allow people to go T4 and still get an IS-2. More diversity is good.
But since the call-ins still cost fuel, it is now, in most cases, better to simply wait for the call-in unlock than actually teching
![:D :D](/images/Smileys/biggrin.gif)