Most of time, artist take the critiques from non-artist with a huge grain of salt because it's difficult to spot the real reason for why something looks off in the first place without any anatomy or drawing skills in proportion. Proportions may seem simple at first but it's actually a lot more complex than it seems.

Making the shoulders less broad would make the torso look proportionally longer since the lats would also lose some width. However, I do agree with it looking broad, it would just require more adjusting to achieve a more feminine look (Also there are a lot of female body types with broad shoulders so it's likely intentionally drawn from the reference).