But why? Ain't that more work for little difference?
Not really, it is a shorter game for the poly route. It most likely be that the harem will be the actual full version of the game and anything else will be shorter versions of this.
If I remember correctly how it was in Sisterly Lust, there was a character (the younger sister) that was the fulcrum for most of the lesbian content. If you ignored her you ended up missing most of that kind of content and dialogue. Also I think that the dev actually spent more time making variations of certain scenes for other kinds of kinks than the poly route.
You know, I am getting curious about my own post. I am going to go back to Sisterly Lust and check my own statement. Be right back.
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Yes I was right. If you ignored the younger sister (Rachel), you get a shorter game by a lot. Barring any fuckup I might have incurred, you miss all content with the second oldest sister Bella (and Megan) [found my fuckup, on day 4 you have to talk to Rachel during the evening to trigger Bella's route], some content with Bella, all orgies with the family, and most content with Nia.
I might later see if you can avoid the lesbian content while pursuing Rachel. If I do I will post about it but the point is that it is not really more work for the dev, it is a shorter game for you if you choose that branch.