Well if you have really meaningful choices with enough content difference than players won't really be annoyed by multiple playthroughs. BUT the story needs to be well written and the differences need to be big enough.
I totally agree.
If it's to have the redhead in one play, then in the next play the only real difference will be that the girl will have blond hairs, stick to the harem.
But if the girls effectively have different personality and need to be seduced differently. If one will want you to stay at home and share tender moments together, while the other will make you discover parts of the town you didn't know exist. In short, if as
GNVE said, it's two different stories, then it worth it.
This being said, I disagree with the other on one point, the supposed incompatibility between meaningful choice and harem story.
A game like
Sisterly Lust, by example, is a harem story, and it have (half) meaningful choice. Not all girls will agree to go with you in the end, not all will agree to marry you, and not all will be pregnant. And it's not the only one, but generally you don't see the significance of the choice. Not because it don't exist, but because you go for the harem, and therefore do your best to please all the girls.
There's also the problem of the realization. If you put meaningful choices in your harem, a scene involving two girls will need to have five variations :
- The girl A isn't part of the harem ;
- The girl B isn't part of the harem ;
- The girl A can't stand the girl B ;
- The girl B can't stand the girl A ;
- Both girls can't stand each others.
This imply a lot more of works for the author, and a good understanding of both the story and the engine to do this well.
Saying that harem and meaningful choices is an impossible combination is just not thinking enough about the story. It's not because most harem game follow the path of least resistance, and decide that all the girls are madly in love with the MC and will not care a single second that they have to share him, that it's the only way to write a harem game. As I said, it would need way more works for the author, but a harem game is an opened gate to the most possible meaningful choices.
In fact, a harem game can have way more meaningful choices than a none harem one. Seducing the girl isn't the only thing the MC have to achieve. Once it's done, he have to convince her to join the harem, and this will need for him to present her the other girls. Here, the order he'll do this matter. If the first girl he present is the little brat, he'll never succeed. But if he present the maternal figure, the girl that decided to take care of all the other, it's something different. She'll welcome the new girl with a "welcome to the family, what can I do to make you feel at ease ?" that will lower the girl's defense.
There will also have meaningful choice inside the harem itself. If the MC tend focus on one girl, or to ignore one too often, it will raise some jealousy. He need to share his attention between all the girls, in order to keep them equally happy over a week. Same with the cohabitation between the girls. They have their own personality, there will always have small conflict that the MC will have to solve correctly in order to keep his harem a peaceful place.
Or he can decide to play with those personalities, standing a little too often against the insecure girl, in order for her to strengthen her bound with the shy, but really caring, girl. If he's on the maledom side, or if she's on the sub side, he can also raise the jealousy of one girl in order to have more opportunities to punish her.
Most harem games end when the MC have his harem, but what if one don't ? What if the story isn't to make all the girls agree to join MC's harem, but to make them not decide to left the said harem ? A pure fapable game (because all girls are already opened to sex) with a story (don't fuck with the relation balance between the girls). A game where the goal isn't to make the harem grow, but to prevent it to shrink. A game where the girls don't say things like, "take me to a date, and we will have sex", but "take me to a date, or no more sex for you".