Think of the men that women tend to lust after on a large scale e.g. celebrities. How many of those men are more muscular than the average male? How many are much more muscular?
Take a look at the all-time top scoring pics on the "ladyboners" subreddit.
https://www.reddit.com/r/LadyBoners/top/
Of those men whose body is showing in the picture, how many have muscles significantly more developed than the average male? 75%? 85%?
I'm not particularly "built" myself, but I think it's extremely misguided to suggest women don't, on average, prefer muscular men (all other traits being equal). Obviously you don't have to be muscular to attract women, there are very few desirable qualities which are actually necessary to attract a partner. That doesn't mean it doesn't help, all else equal.
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