With there being traps and femboys and fun stuff like that being thrown into the harem. I would enjoy some content where the harem along with the MC is enjoying each other. If you want to make that an optional thing for various players then that is fine by me. This is a zombie survival situation on a possible global scale after all (evil lustful laughter); which means that having more than just the genes of the MC being passed on is essential. One way of saying this is that... I would love to make the future world and future human race be more... "Beautifully Sexually Attractive" which includes the femboy genes helping make more beautiful women genetic heritage and stuff. Which would then basically create something like a possible situation where the future of humanity is genetically creating "other sexual genders" of sorts; like men, women, femboy's, etc. even though there is the clear distinction of male and female differentiation.
But the only "Masculine Genes" I personally want to get passed on is the genes of the MC so that all future generations only create "Harems" for the future of humanity in all aspects of life. Also. I enjoy my Yuri in the harem. Very Deliciously so.
I and many others do consider a Harem End as the True Ending of many Harem games. Letting any other masculine dudes get a route to the grave or their own women outside of the harem that is only for them in a way that the MC supports is fine.. depending on the type of woman or how you do the harem end. You could give them women after the ending of the game or have them be playable characters who get their own harems in their own harem plot that doesn't involve being with the MC harem. A good way of possibly expanding the plot so that you don't get people to not support you. Having certain Harem members that are designed to be women who use the MC and the other Male characters as their own Reverse Harem of sorts is possible if you can make them just right as well.
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Yeah bro, letting other men have sex with your women? Only cucks want that. The harem audience doesn't want to see other men fuck with their women... and if the dev really wants to create a harem game and attract the harem/vanilla audience, it's not in their best interest to add those scenes. If they include scenes where other men are with the girls, they're going to lose a large part of the harem/vanilla community. Many people (myself included) as soon as they see that a game has content that includes NTR or NTS (sharing the girls with another man) will ignore the game without even playing it. With the number of games out there these days, it's easier to avoid a game than to play one with content you don't like...