Summoner and Buttons

[Rongway]

This is the same reason you can't have dreadwurm trance on the same button as summon bahamut or firebird trance. The skill has a 55 second cooldown meaning that if they were on the same button, you'd have to wait 55 seconds after entering dreadwurm trance before you'd be able to summon bahamut.

Actions with different cooldowns can share a button, and an action that is hidden behind another due to state-based action replacement can continue to cool down independently of the action that replaces it. Differences in recast times between consolidated action buttons would be a non-issue. The conditions for Dreadwyrm Trance, Summon Bahamut, and Firebird trance are mutually exclusive, and these buttons could easily be made into one button while still maintaining separate cooldowns between Trance and Summon Bahamut.