The people asking for the NTR need to understand that NTR is separated into the "planned" second story. If NTR is put into the game it will last for a couple of scenes after the choice and then it will pop up with "please play the other path".
NTR is a different type of content than Danny. Sure, traps are also niche but traps can fit the main storyline (The alter-ego wouldn't mind banging his ass, seeing the Christmas special), so it wouldn't be too bad adding that option in, while NTR means that they'd need to start work on the 2nd storyline (The choice to go to the hospital to get the alter ego removed, as alter ego would never be OK with being cucked) while the "main storyline" isn't even close to finished.
Though I guess the game has been worked on for over 2 years now, so you've been teased with that tag for a long time.
Although if NTR path were to be added, I'd like it if the "no alter-ego" path would have a non-NTR path to it as well - more of a "true love" path for those that don't want to be cucked, but find the main story's alter-ego to be annoying and exceedingly cringe.