- Compared to what I saw in 0.6.6, Eric had more scenes then the MC. Unless you count the daily, grind-blue balling events as scenes. So in that regard he is right. On the other hand:
You just answered your own question:
"can chose a path were you don't even see him?" I guess there are still some people in 2024 who dont understand that what happens in offscreen -> still happens

.
- If you are in a poly-relationship you are still in a
relationship, hence the partners you have wouldnt be all to pleased if they found out he fucked someone else outside the group obviously. Same goes to the other partners. Unless you talking about -> Open-"Relationship". But that is reality and this is fiction so whatever the creator writes, goes. And unless Im wrong, like the other user, the story didnt mentioned that either Eric was allowed to plow every girl left and right, but on the other hand, again correct me if Im wrong here, one of his wife complained about him already doing it/suspecting him doing it and not liking it.
- Yes...hence what he said -> Is right.
- No. If you are one of these people who are still living under a rock who thinks this way, this on you and there is no real harm still believing in this. I think I dont need to write pointless paragraphs and just google: "NTR" + "BBS". From there you can just expand this pointless knowledge with "mother NTR" and "crush NTR", aka -> Most NTR games on this site
About the moral stuff: Here is a hint.
- People either like/dont like Incest -> Morality? Yes
- People either like/dont like to steal the Girl/Woman from someone else -> Morality? Yes
- People either like/dont like getting cucked -> Morality? None.
Its more about fetishes and less about morality lol.