TBF there's a pretty big difference between your typical vanilla incest harem game with one or two netori girls, games with a really heavy netori focus with some classic NTR inspiration like Away From Home, and then actual NTR style netori games like Hero's Party Must Fall. The last two examples would probably be more along the lines of what that dude was talking about.
Vanilla harem MCs netori targets are usually just girls with an abusive or neglectful husband and there's not really much focus on the cuckoldry. Actual NTR is about a lot more than that, there's usually some kind of manipulation, deception and often blackmail. Plus there's the focus on the destruction or subversion of the existing relationship and often the humiliation of the victim.
I get the dude's complaints. Those kinds of stories are fun and they're very uncommon. Actual NTR games are almost always played as either the cuck or the heroine and it is a shame because legit dedicated netori games like Hero's Party are super fucking hot and really fun.
