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My point is that Rider would happily fuck Shirou anyway, I don't think that her wanting to get a bike out of the deal is really that bad.
I'm not worried about Ilya and Kotomine scenes, but Sakura and Rider deserve not to be fucking ignored again.
For that matter, Sakura matters in approximately 1 route... and even then Kotomine is so much more interesting than her than her in that.
What does Sakura do in Fate and UBW?
Doesn't matter, because FSN isn't just Fate and UBW.Plus, she's important to the setting as a whole (she's Rin's sister and Rider's master), you can't really understand the whole story without knowing her story.
Sakura is still a damn important character in the story as a whole. If they're going to overlook HF again, they need to at least involve Sakura elsewhere.
But the anime is advertised as "Fate/Stay Night", not "Fate" or "Unlimited Blade Works". And, as I said already, we have an existing Fate adaptation, and a UBW one too (albeit a really awful one), so if any route should be adapted, it's HF.