While I agree that Emma specifically is too strict right now, and existing harems give a wrong impression, it is the stated intention of Andrealphus not to have an all-encompassing harem, so some girls will be mutually exclusive, with Samantha/Emma being the prime example. (Here's hoping he'll change his mind, but for now we gotta roll with it.)
it is possible to get both emma and samantha, the issue is, as the wiki states, in order to access the new content, you need at least 2 out of 3 "love points" to continue, you only have 3 scenarios where you get such points, during the new cinema date, you have to pick either you like boys kissing or you don't tell her its icky, then the emma and bree talk at university, which is , as the wiki states, if you picked the gamer bree path, it's broken. you just don't get a point there if you picked gamer bree. if u picked maid bree, she needs girl points to be like 45%? or something, to get it. and it is impervious to get it, because you can then not have to break up with every girl you are dating, you can get that penalty. However, you cannot break up with all the girls. Because if they're your sex slaves, it counts as a relationship. So if you pick gamer bree you cannot progress with emma.