You should be able to queue up actions like in an RTS. I can't think of any good reason why wouldn't have that.
Ok, let's give you some:
1°) AoE and even CC abilities mean that you can't queue actions without constantly having to unqueue them, as not only enemy moves, but status effect means you need to quickly change your tactics. Having action queuing will mean that the tactical elements of the game will need to be lessened in order not to make the queuing an actual detriment/hassle for the player.
2°) Having queuing action will institute a "use abilities all the time" reflex from the player, and it doesn't mesh well at all with semi-Vancian magic. This means that players will want to rest more and more and more, and it will completely skew the game's balance.