Quote: who holds the responsibility? Both are responsible for their actions to a point, but one carries that burden more than the other.
Both. 100%. While a sub might make things look easy (and maybe they do make that talent easy at that point) both have to use their own initiative.
Also keep in mind then when a sub suffers for a dom (as a punisment for example. But can just as easily be because it's for fun) that is a burden to bear as well. And one I'd bear gladly in the right situation with the right company. While a dom give direction, there are times a dom can forget how to play, so to speak. Which in itself can be something a sub has to bear the burden of. The reverse can just as easily be said. Depending on who you ask.
It's which individual is better at things like, say, playing and giving guidence. Even if such guidence might be followed. A good team leader knows how to be a part of a team. And a good team player knows how to lead. A dom has to go with a subs flow just as much as a sub has to go with a doms. Though a dom might give a little more direction. On the flipside subs and intiative. Can't always be hand held.
That also means if someone is good at one side of the fence they can be equally as good at the other. But again, that's going to dependon who you ask and how good they are at going with the flow of others while getting others to go along with their own (which circles back to playing).
A dom also tends to enjoy being in control. So I wouldn't call that a burden. If anything it causes less problems. Which can be a talent struggles to pick up until they get the hang of it (as can doms. But doms pursue it more). Confidence itself stems from honesty, trust, awareness, etc. You know the rest.