I cannot see why. Yes, an incest romance will face adversities, but that's what makes a story interesting. Agreed, many "romance" aspects in games on this site boil down to "You great tits, me horse dick, let's fuck", but that's not a problem with incest but with how they are written in general. I cannot see how "romance" is prevented here. I could tell you about games or paths in games which seem more romantic (as opposed to "blackmail" etc.) to me and certainly can live without domination, corruption and the rest you offered. Basically two people like each other and it's not just the sex.
That's not to say that the other kinks can't be fun - they can (I'll skip the rape, but in the end technically blackmail sex, or mind magic are rape, too). But they can be that independently of the question of incest. And so can "romance".