I can narrow it down. I get stressed out in relationships where I don't have absolute power. I get stressed out easily, so I like to have that bit removed. It's not that I'm lazy. I just like to be able to focus on the important bits, and in more equal relationships, maintaining the equality takes a lot of effort. I'd rather put my effort elsewhere. Most decisions in everyday life are arbitrary. Better to just have head taking those decisions. And since I'm by instinct thinking what's most practical for the whole group.... well .... if I wasn't in a D/s relationship, my needs get lost somewhere.
It's what works for me. I like to stick to stuff that works.