Idk, I'd challenge the assumption that muscular = masculine. I'm not as particular about her height (I think she could be tall but I don't think she needs to be, like, 6'5") but I do think it's a little troublesome to have Superman and Batman - the physical ideals of masculinity - portrayed as massive and jacked while Diana looks like Lynda Carter or Gal Gadot. It's just feeding off of the cultural pressure for women to be as small as possible.
I think the bigger problem is when artists make her look like a buff dude with **** (really top-heavy, disproportionately huge biceps, vascularity). There are ways to make her look strong and muscular while still making her look very feminine. Great example would be Will Murai, who draws her very muscular but not masculine - she's got the defined shoulders/biceps but she also has wide hips, a defined waist, thick thighs, and more of a pear/hourglass shape:
Or for a more famous example Darwyn Cooke - his Diana looks strong and ridiculously tall but she's still very feminine: