(Hint: read in angry brittish man accent)
Your argument in the developer's note is a little strange.
It's all up to the player's imagination. This might very well soften the NTR elements if you don't picture yourself as the MC who's being NTR'ed^^
It IS called
Main
Character, because you as a player are playing this character. Therefore if there is no option for the MC I'm playing to act different than a beta bum, a vein on my forehead throbs almost to the point of bursting.
(Oh no, I am completely hopeless. Let's just see my wife get fucked by another man and do absolutely nothing but hoping to "stay married". Divorce, nah too hard. You call my wife bitch, cause she gets fucked by another man, fuck you! [Dude, why not throw her away!? Find another better "more resillient" woman? Or cuck someone else!?])
Additionally, even if I were to try and put myself into the big black bad wife-magnet (I like Netori, I hate Netorare), the "interesting" story would be too short and everything else building up for the MC and cucked wifey becomes completely irrelevant. I wouldn't have the motivation to play through all that if I as a player can't change the outcome. Might as well just read a story intstead of playing a "game".
99.9% unrelated:
btw. if you try to argument with "non-multiple-ending-games" like The Legend of Zelda or Final Fantasy or Assassin's Creed, they give you at least an illusion of control. That's why even though I like the Fire Emblem series, I hated the MC in Fates. I hate irrational incompetence. "Oh, a small provoke? => Emotional breakdown!" "Oh, I wasn't able to save that ONE friend because of not thinking through things first? => Emotional Breakdown!"
EVERY OTHER FIRE EMBLEM MC AND SIDE CHARACTER CAN USE HIS/HER BRAIN!! WHY YOU NOT!?!
TL;DR
If you have a non-NTR route planned for "every" bachelorette*, I can't wait to see it.
*bachelorette = love interest of MC that is of opposite biological gender
Edit 1:
- added tl:dr
Edit 2:
- added definition of " * "
Edit 3:
- added exlanation for "Edit 1&2"
Edit 4:
- added "Edit 3"
- added "hint"
Edit 5:
- reformated "Edit 4 information"
- moved "hint" up