There is truth to this. Burning Wheel’s character creation is beloved for a reason.
I think there’s something else though. I’ve been sort of stewing on a response. But I think a fleshed out system makes doing certain types of things satisfying. Power is always relative. If everyone has the same power, then power is meaningless. So systems which give you a broad range of skills, but in a way that feels principled and nuanced and interesting and provide the opportunity to invest in it and grow in it, create a much more material sense of power. In a PbtA you just…roll and do the thing. In many cases, a roll can be used to satisfy some very high level things. Tricking the werewolves and I dunno, pulling off the heist, can be a similar role.
But in ars magica if you grapple with the magic system, you can make a spell that will melt a castle. That will turn an advancing army to dust. And perhaps to your point about “math loving types,” it feels earned. I don’t know if grappling is quite right, because I think us grit lovers also love elegance. But it’s that…if you put in that work and put together that spell, it’s framed by the rules so it isn’t arbitrary, but it feels much more salient and powerful. The key thing I’m thinking through is: why does having a system for something make it feel more salient?
Fireball and lightning bolt are good examples. They feel the same to me. But they feel very different from shooting an arrow. But in DND, you don’t get the sort of…open ended creativity of ars magica, which is sort of a unique strength of the magic system.
I haven’t quite been able to quite crack what I’m thinking/feeling but there’s been a lot of great discussion! It’s helped me think through a lot.