A lot of Olympic lifters are incredibly strong and look like shit, small muscles.
Conversely, a lot of lifters are incredibly strong and look great. Not sure what your point is.
You seem to be conflating muscle size with aesthetics. Big muscles in and of itself does not guarantee that you will look good.
I can just as easily say that there are a lot of lifters that are not particular strong with small muscles that look great. You being a
prime example.
My only point is that all else being equal the bigger the muscle the stronger the muscle. If you can curl X amount of weight for 8 reps you will be able
to curl even more for 8 reps if your bicep muscle increased markedly in size. But it is true as No One pointed out that an increase in resistance for any particular movement does not translate into an automatic increase in muscle size. So many factors are involved when one moves a particular weight.
When I was in high school I remember telling my friend that I always seemed to be a bit stronger when I trained with a partner or if a hot chick was watching. My body was the same but my daily performance varied somewhat. I asked why do you think you are stronger when training with a partner or when girls were around. He just shrugged and said, "I don't know. Maybe it's because you want to be."
He may have been more right than either of us realized at the time.