I think people are overreacting.. this change happened, what, two hours ago?

Play for a while, figure out what's been done, and adapt.

THAT'S the fun part.

If, tomorrow, we figure out that NPCs are not impregnable fortresses, and you can't attack anyone, then start complaining.

If, instead, we find out that ballistas got downgraded, or, perhaps, just perhaps, they improved the battle engine so that ranged troops near ground troops to cover them... we'll adjust and move on.