Well, they didn't give Kate a host spot, technically. They chose not the use the host spot after the women they'd picked withdrew, and then picked someone on the replacement list rather than leave the spot empty. Functionally, it's pretty much the same thing, I know, but I don't think the focus should be on Kate Wang and her merits (not saying you were, just that I've seen that).
I'd have preferred they give it to a Canadian women, of course, but I also understand that the options were limited. I think that if Lia Pereira hadn't already competed on the JGP, if they'd known this spot was open a few months ago, they might have given it to her. She's the oldest of our JGP women, she has some experience having done the JGP and JW, and they've given her a senior CS assignment this fall. But she's not available. Nor are Sara-Maude Dupuis or Justine Miclette. We know Kaiya's been injured. If she's ready to go and wanted to do the GP, then I would rather have her than Kate, obviously. But she's just coming back after multiple injuries and a long time not competing. I know she did a domestic comp this weekend, but that's not the same as a GP. So maybe a spot at SC wouldn't be the best thing for her. Hard to say without knowing the details.
You've suggested Fiona Bombardier I believe. I don't know if I'd be in favour of that. I definitely want to see our skaters get more experience and opportunities, but I also think you have to be careful about throwing people into the deep end. According to her ISU bio, Fiona has had one international competition, and never even done a JGP. Yes that's on SC, but going from one single junior B event to a senior grand prix would be a big jump. She's been competing junior domestically this summer and had decent results (139.48 at the NextGen simulation, 130.75 in Quebec), but not as good as several of the other junior women. They aren't available because they've done the JGP, but the point is that I'd be concerned about taking someone with almost no international experience, who wasn't even at the top of our juniors, and throwing her into a senior GP. Maybe it would go fine and be really valuable experience for her. If they'd picked her I would be supportive, but I also understand why they wouldn't want to go that direction.
So that leaves the senior women. We haven't seen Alicia Pineault, and I think they'd be considering her if she was available. So I'm assuming she wasn't an option. So there are the summer competitions. Amanda Tobin got 152.98 at the July Skate Ontario event (when you combine SP and FS), and scored 132.38 at Cranberry International. Katherine Medland-Spence got 148.04 at the August event and 123.03 at the July event. Audréanne Foster got 148.83 at Souvenir Georges-Éthier, 151.15 at the Quebec summer event skating junior, and 116.78 at the NextGen event. Those are the three who stood out to me when looking at all the summer results (+ Uliana Shiryaeva, but she's not been released by Russia). Audréanne has done a JGP, and has at least done a senior domestic competition, but you could have the same concerns with her as with Fiona. They could have picked Amanda or Katherine. That's probably what I'd do.
I think, to me, the bigger problem is not sending these skaters out to Challengers and Senior Bs. I understand why they might decide none of them are ready for a senior GP, based on their scores (I mention scores because if someone was out getting huge domestic scores, they'd send her regardless) and lack of international experience. Thinking that maybe the GP isn't the best place to start getting that experience. I think that would be a valid position, if if I didn't necessarily agree. But I at least want to see more CS and B event assignments. Sylvia from Unseen Skaters posted on FSU that she thinks Fiona will be going to IceChallenge in Austria in November, based on an Instagram story from her coaches (not clear on whether it'll be as a junior or senior). Skate Canada also has Warsaw Cup and Golden Spin on the international assignments page, so hopefully some other women will be sent out (seniors or juniors). Skate Canada normally sends at least of couple of girls to junior B events in the fall, and they've already given Lia a Challenger (possibly due to her strong result at Cranberry). I'd like to see Justine Miclette get one as well. And hopefully others.