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In the fifth installment, having a turn without waiting would simply be overpowered, even the "Word of the Leader" spell was quite useful, although the target creature didn't start moving immediately; the hero would damage it a bit, and it couldn't be used at any given moment. Here, things are different; without the ATB scale, much of its relevance is lost. In some specific cases, it will certainly be useful. But you can also miscalculate with it. Heroic Advance is self-explanatory. The benefit of a defensive position significantly depends on the specific bonus to defense it provides. I wanted to take it in the game, but then I changed my mind. Let's just say that, again, due to the ATB scale in the fifth part, it would look better when applied to some low-initiative units that were deprived of infinite retaliation (some hydras, unupgraded ents).
Added 1 minute ago
Although there was readiness, that's much better...