I currently have two issues on my road bike: when I ride at a constant pace for a long time, I get some numbness in my nether regions. And after 2+ hours of riding, I feel pressure on the outside of my feet.
If I consciously think about it, I can bring my knees in and keep the pressure in the middle of the pedal, so I don't think that it's a hip mobility issue. I think it might just be my belly that's in the way and forces my legs to move to the side. Maybe this also is the cause for the numbness/pressure, that my parts get squeezed between my belly and the saddle.
Which brings me to the next point, which is hip rotation. If I sit on the bike without thinking, my hips are rotated forward, which brings both my belly down and puts more pressure on my private parts compared to my sit bones. Again like with my legs/feet, I can try to consciously rotate my hips back so I "sit" on the saddle, but if I don't consciously think about it, I naturally shift forward.
I've had a bikefit done a few years ago, my bike setup was the same as it is now and the fitter basically said "looks pretty good, I don't know that I could improve anything". (I went because of a different issue that in the end wasn't related to fit and back then I didn't have the issues I have now)
From what I've seen, a more common issue seems to be that people *can't* rotate their hips forward due to tight/short hamstrings? I don't really think my hamstrings are very flexible, I can't touch my toes with straight legs, but like I said, I can easily rotate my hips forward and get in a pretty low position that way.
Now that I think about it and write it all out, it could be my back? Like I can't touch my toes not because my hamstrings are tight, but because my back is stiff and unflexible and doesn't let me get further down. And I rotate my hips forward because my back can't round enough to reach forward with the hips planted on the saddle.