FrogReaver
The most respectful and polite poster ever
Its not that situational though its 99% of the time in every combat round.
Its obvious though Mearls is not going to give you at will attack granting as he is not drunk and stoned. Hell he is not giving you the WL as an independent class, if the WL lands as a fighter subclass its basically allover for the WL as an independent class.
Speaking of drunk or stoned... Mearls wants to give something better than at will attack granting. Essentially all the time prone with fighter level damage and extra feats. This tactical warlord may actually edge out the battlemaster in terms of GWM DPR and that's saying a lot.
But more importantly,
At will attack granting works fine as long as you are granting the attack on the allies turn you are granting the attack to. It's when you can grant your ally an attack on your turn or on another allies turn that it's a problem.