People tend to think big muscles means big strength. In reality it’s not necessarily the case at all. You can build very big muscles that are basically useless. Not only useless, but actually detrimental to your ability to move. The TYPE of muscle you have makes all the difference.
I’m not referring to muscle type as in slow twitch vs. fast twitch vs. super fibres or other names that have been invented for various muscle types. I’m just referring to muscle type as in efficient vs. inefficient - in other words, does your muscle development support and allow your movement to happen naturally and easily or does it get in the way.
Muscle building just for the sake of a particular aesthetic is one thing. Let’s leave that aside for now. In the context of movement, athleticism, performance, fluidity, coordination, agility, etc... you should focus on movement development and not muscle development. There is a significant difference. The typical machines found in gyms and exercises targeting muscles as opposed to patterns might develop your muscles, but they won’t do much to develop your movement and may in fact severely hamper your movement.
Lastly, muscle and movement are definitely not mutually exclusive. On the contrary, someone with good movement develment will have a more balanced, natural, athletic look, usually with well-defined muscles and a flexible, elastic type of strength that provides superior resilience.
Better movement = better muscle. But bigger muscles does not mean good movement.