Should all classes require the same volume of input?

If I have to hit 20 ish buttons on lnc a min, do I also need to hit 20 ish buttons at similer intervals as pug?

Do all classes need to use the same resource? is stam/mp/tp really required for everyone?

If your class is designated by your weapon IE magic in staves and swords, guard in shields etc, why can I cast cure with EVERY sword? and why can't I cast cure with a sword as a mage ? I know this sounds silly but it is a pseudo serious question, it seems that the lore of the system seems laking to me. Right now it feels like SE has an armoury system that defines the universe, but doesn't give any lore behind it. Here is a staff, with it you can cast magic, here is a pair of kncuckles, with it you can guar, and punch, but if you have ever picked up a staff, they can heal you as well? this just seems odd. If there were special knuckles that allowed you to access a certain amount of abilities of other classes, like these knuckles arn't as hard as other types but are imbued with certian magics which allow you to access known magical talet. Without stuff like this it just seems like a whacky universe and
un FF like.