Sure, for those who enjoy cucking, it should be an option. Never said it couldn't or shouldn't be available. But option, means optional, as in making a choice to pursue that path.
But including it as more or less mandatory part of sharing path is not cool. That just makes it obvious-up-front NTR as opposed to oblivious NTR (the usual variety in most games), in my view, sorry. Especially if cheating stats, as in this game, are zero for both partners, and yet "sharing" is high. That ain't sharing, it's cucking, as it stands now, and that should be an option, not a given.
And honestly, that's where so many devs get this whole idea wrong, in a western setting. I do concede that Japanese style games have this as a default, along with the whole shame/humiliation bent, but I don't believe that western society sees it this way. Its why I don't play Japanese games, at all, and why I am here on f95, not prowling Japanese sites. Its a different mindset.
And I am happy to be disagreed with, but this is just my opinion after all, and so it sets my preferences, just like yours do yours. And all that is cool, or should be. I ain't kink-shaming anybody.