The difference between a "horde" and a "concentrated effort" is pure semantics. I think the numbers are generally much more balanced than they were -- although the current mindanao map has frustratingly few points of enemy contact. That means that when superiority is achieved, it quickly becomes dominance. That's very different from a horde, where one side outnumbers the othe by a hundred or somehting. I'm a rook, and I've flown outnumbered fairly often in the last few weeks.....
And while taking out troops is tactically sound, it takes away gameplay for others and sustains the "horde" over the dominated bases. If a couple bases fall, the attack gets diffused over a broader front while the defense gets more concentrated and thus more effective, more focused. making troops tougher to kill would increase gameplay, increase give and take, and increase fun.
I'm not saying to make them as tough as a shore battery -- but a 110 shouldnt be able to get more than 1 or 2 bases' worth down in a sortie. That doesnt seem unreasonanble to me at all.