What I'm saying, though, is that there is a strong probability that players will get frustrated if the preset system isn't a bit more complicated than a blanket level 3+ offensive spell preset.
Are you frustrated when you play Xcom if your overwatch doesnt trigger on a specific ennemy ?
You aren't because that's the rule of the game.
Different games, different rules, different resources involved and situations at stake.
For one, XCOM is basically “alpha strike: the official game” where you are supposed to blast everything during your team’s turn and Overwatch is basically the throwaway option (that comes with the aim penalty too) when you don’t have anything better to do.