Where did you get the "indoctrinating children to be whores" part from? Savin and Fenoxo are pretty vehement about there not being any loli/shota content in their games.
It's not main quest content though. This thread has a serious problem with reading comprehension, this is like the third time I've seen people misinterpret something and then start pushing it as fact this year.
Cait and Calla were born to a harlot of one of Mallach's temples in Jassira, meaning that they were on there way to being indoctrinated into being harlots themselves - being made to accept that is the way it is from birth.
Sure they still had freedom of choice,
yet it seems that Calla was ostracized for not going along with it; something that is hinted at within the latest temple content.
Cait was more accepting of it, and one could definitely hypothesize that she
might of partaken in some of the temple's activities prior to "coming of age" as they put it, although that's not explicitly implied anywhere (so it's likely not probable).
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, and she left the temple at age 18, so yeah, unless she only started "performing" at the temple from 18 (for like a few weeks ?), then that'd be the extent of it. Although she definitely seemed coerced and almost guilted into the lifestyle by her mother / temple lifestyle. She only left because of her sister who was chasing their dad.
Regardless, it's not the potential underage content (as some people would likely be offended with that anyway, and it would also go against Patreon's T.O.S and FenCo's / SavCo's ethos) that people are explicitly taking issue with within this context, it's the indoctrination / coercion of the children born to harlots in those temples into being the exact same themselves, leaving little freedom of choice, and leading them to likely being "gaslit" from youth due to their "religion".
And on your point of it not being main quest content - it is related to main quest content - it's a decent bit of lore about the game that you won't get if you don't build the temple. The end goal is arguably to defeat Kas (either by romancing / overpowering / ending the spread of corruption), losing out on somewhat vital exposition and world-building / lore in the game pertaining to the games main antagonist is not great, especially when it's gated by a false choice scenario once again, like with the Centaur Village Quest ending or the Orc Camp Quest ending.