Some people apparently need Rowan to be a raging roidbeast to have a complete power (fantasy) trip. Thing is, muscles nowadays are merely for showing off and don't translate into practicality. If you have ever seen any documentaries about hunting-gathering tribes living on their own, none of their men (or women, for what it matters) look anything like the gym-exhibition crew.
They chase prey, throw javelins, carry immense weight on their head, back and/or shoulders... They get to do a lot of physical work and consume calories efficiently, covering their daily needs, and don't look like a bunch of skinned gorillas, but rather achieve graceful, harmonious bodies that fulfill a purpose. Something natural and beautiful.
There's also a misconception about the kind of physique you need to move an armor, as it's designed to distribute its weight all over the man wearing it, and being articulated offers great freedom of movement. Those 20, 23 kilos move like a breeze. The main issue comes with the under armor padded protection, that it's often kind of thick and tends to get wet and uncomfortable with sweat. That's what fills the armor, not ox-like muscles.
Even with the 40 kilos armor+supplies package that some of the Roman legionaries had to endure for 20 km a day under some emperors, people were not grunting macho behemoths, just average-Joes with stamina built from resignation, duty, and ordinary ranch, not protein shakes.
Then we've got the other thing. You can be a perfectly good Dom without looking like a bodybuilder. Seriously. I'd even go the extra mile and say that those who rely on mere imposing physicality are often taken for unrefined, boring cavemen in the scene. The "me strong, you weak. Submit grrrowl!" gets old in a couple of sessions. It's not primal, but basic... And basic always means "easily replaceable", pal.
You don't build a pack/harem like that.
Rowan is a versatile character in every sense of the word, and that is perfect