Without criticising anyone's vision because this is purely about my preference, I like when characters feel like a more credible version of their original design, Adora is fairly scrawny for how much she must work out and how physical her character is. But I still like her to look like the design I feel in love with in the show.
So that's why I prefer "buff but not too buff" designs for her like in this drawing, not because I don't like drawing of extremely buff women (I absolutely do love those as well xD), but because it helps me relate the fan art to the original design. I have a similar opinion on a character like Yamato from One Piece who I like to be depicted buffer than in the manga, but not like a bodybuilder either because he feels too far away from the original version.
Once again, this is personal preference, it's not like I think artists shouldn't draw them how they want of course!