Don't forget that the Training Grounds will eventually support FIVE different units, not just the Cerberus.
Yes...so we get more and more different units doing about the same thing. That is NOT an improvement, that is making things needlessly complicated at best.
Take a look at the stats for the Orc-warrior, then compare it to the Elder Treant...duh.
Adding new stuff that doesn't actually do anything else and is not seriousy superior is only hot air...nothing of substance. Except that it will become required stuff to research, so they have yet another way to hold up their players, by making them spend a lot of KP on things that do no good at all.
And as Draconomicon so very well stated...eventually
. It took almost half a year to actually get the fairy units, but we were still required to research them...a lot of KP wasted on nothing at all at that time.
And now that we have them, they are laughably weak. Absolutely not fit to be such late-game units (well, now almots mid-game, with the new chapters, but still)