ATB, if I'm not mistaken, turn-based is when one player moves first and then the other???? But even in Heroes 3 units didn't move consecutively; some could start first and then others, but the turn ended with the first ones again, almost like initiative! Isn't that right... Now, as for the ATB scale, why is it worse? Of course, it differs from Heroes 3, but I think it can be replaced by a damage bar???
The elves will still shoot several times before the zombie's turn comes around. And as for turn-based combat, I consider that type of battle where, for a unit that has already acted to get another turn, all other units on the field (both yours and the opponent's) must also move (unless they are affected by low morale or are under the effect of a spell).