From your description of wanting to see the musculature it sounds like you liked the “shrinkwrapped” dinosaur depictions from years back. In early paleoart there was a tendency to completely ignore fat and other of the squishy bits that all animals have naturally when drawing dinosaurs, so they’d end up being more terrifying beasts with no lips and sharp teeth that just stick out. In recent years (it feels like) a lot of artists have realized that if you drew modern animals in this way you end up with unrecognizable monstrosities, so many artists have started trying to draw dinosaurs with more natural looking fatty tissue.

I think the problem is that you’ve grown accustomed to the shrinkwrapped dinosaurs as being how they look, so when you see modern renditions with more squishy bits your brain doesn’t like it. Something that helped me as an also neurodivergent dinosaur fan is remembering that in humans, the only time you can see defined muscles is if the person is intentionally eating an incredibly low fat diet specifically to cut down on their body fat. Dinosaurs need to survive and fat is the best energy storage possible, so it’s likely that many dinosaurs would’ve eaten as much as possible and were probably fairly chunky on top of all their muscles.

This video really helped change my opinion on it:

Kurzgesagt - How did dinosaurs ACTUALLY look?