People - myself included - didn't complain because the Author made this very very bad ending. People complained because NOT-getting it was way more difficult than passing through the eye of a needle for the camel, you know.
This is why I have to agree with him and disagree with you.
Because it's so easy to get in a relationship with two ladies IRL, am I right ?
This game is made to reflect that it's not just "want sum fuccs ? Y/N" and depending on how you act you'll get a different reaction.
It would be SO MUCH easier for the Cap to just say "fuck it I'll have two options for the girls, you're with them or you're not".
The fact he doesn't and still work hard to multiply variations of even some similar routes should be a pointer to most about what experience he's trying to offer to us.
We're so used to having all the girls in games we became insentivised to the fact that it supposed to be the exception, not the rule. This game is based on this. I don't see why it should be such a bad thing it's "hard to get". And yeah, while harsh, scene 7 is a very good shock and reminder that your actions have consequences. The fact that it's unusual shouldn't be blamed on the Cap imo, but on the countless mindless games where they don't.