1. all put together those make up about 1/10th of the actual characters in the game. it is a bloated game, there are a fuckton of NPCs in it.
2. a bunch of those are nameless NPCs or random encounters.
3. characters are judged by the amount of content they have. you list some placeholder characters.
for example you mention
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when you encounter Infrith for the first time you have an option to rape her which explicitly stated to permanently close off all future content with her and Hretha. If you do it anyways you get 1 short sex scene and move on.
If you don't... then you don't do it then there is literally zero content for her. you don't get that scene and find all other interaction with her is a placeholder.
Her wiki page was created 3rd of september 2019.
So she is a placeholder character introduced 5 years ago and remained a placeholder for 5 years.
Most people don't even remember such a placeholder character exists.
Compare the amount of lines of text for her compared to any of the futa characters.
You even have the gall to list literal "salt mines" explicitly designed to upset and punish the players like Kiyoko (mother of Kinu).