Yeah, people aren’t naturally that bulky, even very strong people. Look at guys that actually do strenuous physical work every day as part of their job, they are strong and muscular, but their muscles are usually lean and compact. Bodybuilders go for bulk mass even though it doesn’t offer any real advantage.
Too often I'll be called upon to lift/move something ridiculously heavy and I have to remind folks that; "These muscles are for display purposes only".