Because the DLC factions were designed later. Relic released CoH2 in a time when their previous publisher, THQ, went bankrupt. They had to push CoH2 out in a state that most certainly didn't match their intended conceptual design completely.
I think a lot of things/ideas were scrapped from the Vanilla factions to simply reach and/or realize the launch of CoH2. These ideas and utilities you now find in the DLC factions.
