Many classes have this problem. Paladins, MCH, DRK, GNB ect all have a 1-2-3 combo that doesn't split or do anything interesting. If you queue for PvP you may very well find you have a single button that does the entire combo. They have gone so far as to have the NPC scions with you that you take control of in various story dungeons also have this mythic one button combo *Glares at Thancred*

It is a mystery why they do not give them to us, especially after they wanted to remove "button bloat" by removing many fun abilities while retaining pointless multibutton combos.