They aren't really that different, both the turret and Bahamut auto attack every time it's master attacks, and both have a special attack that can be manually executed. The only difference here is Wyrmwave has a recast of 1.5secs to which if you happen to deal two or more consecutive actions quite quickly in that time you risk missing actions from Bahamut as it would either queue up or just not execute at all.

I know what you are discussing that's why I also mentioned the fact that if you need to move, Bahamut often prioritises the movement first rather than attack even if you have commanded it. Yeah great let's add a timer to see Wyrmwave but that's not going to do much good if Bahamut is still occasionally unresponsive. Essentially the harmony between MCH and turret works better than SMN and Bahamut, which really shouldn't be the case.