As a brand it's often better to get consistent, aesthetically pleasing, lifestyle content than weak and inconsistent shots of someone skiing well. If you look at it beyond the perspective of being part of the core skier demographic, accounts like these are easy for the average consumer to romanticize, and offer a hope to escape per se to wherever they are or exist in their lifestyle. It's the marketable "attractive people in attractive places" sort of thing. So, the "deal with chicks who have 10,000+ followers and a bunch of sponsors," is that social media is a huge discussion in itself, but their approach is one of the many ways to work it to your advantage.
I agree that the ladies like Gio and Taylor need more recognition. However, I don't really think that they are necessarily comparable to the examples you provided other than gender. They are two very different approaches to the sport, social media, content, etc. (just a thought, would love to hear what other people have to say on that.)
People don't necessarily follow accounts like the ones you are talking about for the skiing. They follow it because it's pretty and we instinctively like that.
is what you need to be following if I understand what you're looking for correctly. Offering stoke to the kind of content you want to see, i.e. ladies actually sending, is how you encourage that niche to grow and for more girls to post their stuff.