The training/feeding event was removed with good reason, and the reasons have been explained in great detail.
More than that, the combination of training/feeding and breeding would cause additional problems, which have also been discussed in great detail.
So no, they shouldn’t have.
Really? Why? It doesn’t take that much time unless - like me - you’re obsessive enough to run through the level-6 bases again and again until you get them.
And even then it can be finished much faster than any of the other events, unless you keep replaying levels trying to get the max scores.
That was normal during training/feeding, not during breeding. While they have done occasional one-off boosts - say, increased lumber during fort - there was not one this event.
As Morreion pointed out, most players would far prefer inners and energy packs over food packs, XP boosts, or potions, as all those things can be replaced with a few minutes of grinding.