Originally Posted by
Altima of the Gates
I don't really agree with this. There is more than enough to really show Sakura as part of Shirou's family, and hinted at things to come(her reaction to Saber, the mark of the chosen, pretty much all the weird stuff with Rin).
Sure, Rin and Saber are more dynamic, but it's because the "girl who drops from the sky with superpowers" trope just works, add more points for swordswoman tropes.
And Rin was designed to be the knowledgeable one of the group to guide Shirou, plus that school idol-ness thing going on. They are ideals, Sakura isn't, and her flaws are more overtly presented than the other two.
Sakura is in trouble herself, and sees her life that was starting to get better crumbling underneath her. The game did well enough that you can see where she stands on things, and her private talk with Shirou in Distant Twilight pretty much succinctly showed what we saw in the past routes, her apprehension with Rin, how she feels about Shirou, her thoughts about magecraft and what she was hiding from past routes, the works.
You can go back and realize that logically, Sakura trying to get herself more involved just has too many downsides and not many if any upsides. What we learned in HF is that the war is pretty much all a buncha BS, so her reactions are realistic for her circumstances. Any side material would have be mostly internal narration that sounds like it would be from Shikamaru or Touma, where she muses that shit sucks because there are no good routes for her to take.
No, girls get plenty of scrutiny these days. Plus, Ilya and Arc are liked for a plethora of reasons. Ilya's overpoweredness is not even shown very much in FSN, the anime made her herself look threatening outside of just being Berserker's master, so there were other factors at play for her.