They didnt `forget` Orc tracker with summoning skill, he gets boost from it and is new unit in CW expansion. Instead developers made some weird decisions with Rune mage and mechanic instead, but it`s already done and finished. I hope they fix that mistake in brand new and almost piblished KB 2-The Wedding of Amelie&Bill
On serious side every game have some problems, it`s our job as players to find htem , and inform ppl in charge to fix them in future (hopefully).