I'll try to be cogent and coherent here, but apologies for any confusion.
Mr. Bandit, a lot of what you're saying is correct and makes sense, but I also think you are conflating some things a bit too much and not taking Japanese culture and the way they look at things into account enough.
In regards to netorase, I believe you might be close to the mark with some of what you've said in terms of swapping and the feelings involved there, and it's true that it hasn't been touched on nearly as much in Japan as netorare and netori topics. But I do think it's important to always distinguish which of the three you mean when it comes to this type of discussion because, while related, the thoughts and feelings behind each are obviously very different and they all have different goals. Some people can enjoy all three types more or less equally, but that's in the same way they might enjoy various other fetishes across a wide spectrum. I don't feel you can tie them all together and say, 'This is what the Japanese are trying to do,' with regards to NTR as a whole, just as it's hard to say any disparate group of authors are working towards a common theme.
I agree that it's nice that they're starting to do more with netorase works--and thankfully, there seems to have been a good fan response when the quality is good--and I think you did a great job at explaining what makes netorase and sharing situations work. I do think it's important to remember, though, that a lot of authors aren't trying or wanting to tell such a story. They're aiming for a different feeling when it comes to netorare, and the bad and negative feelings there are paramount in those stories, especially as it ties into Japanese culture. Most of the time, a Japanese team is not trying to catch or create a world impression of a subject, but rather tell a hopefully entertaining story that will turn a profit, and as such they attempt to cater to their primary audience of Japanese people who have their own already ingrained beliefs and expectations as it relates to their culture and society.
You've brought up a lot of interesting points and ideas, and I look forward to reading more. It's great when this thread is moving as fast as it has been recently--even if it makes it a little harder to keep up
some times!
I totally agree with you on all points and yes I was kinda making a blanket statement but more so to easier explain my points. I do feel overall that each of the 3 "terms" can easily be defined in english terms though as the same things.
I feel Netori is actually an entirely different fetish thats simply been lumped together with the other two as well. In the simplest english terms its basically another word for "homewrecker" in every way. Which is as far removed as can be from what the sexual triggers of netorare and netorase create.
Netorare is basically the japanese term for cuckolding and netorase is basically the term for wife/partner sharing/watching.
Its funny in the same way one can look at the western fetishes they occur the same in japan just under different names.
For example the term "cuckold" porn is hugely popular in the west IN SALES, much like netorare is in japan - and theres no lack of commercial material on the subject, ironically though its MOST sought out by single men - not couples in relationships.
In contrast wife watching or sharing material makes up the MAJORITY of amateur porn (so real vs commercial) - whats actually interesting is couples that DO implement cuckold play do it in a vastly different way then its often portrayed in commercial cuckold material - where commercially its meant to purely humiliate, in real life play with couples its simple used to tease and excite.
Whats the difference you might be thinking, well in netorare and cuckold porn its MEANT to hurt their partner. In real life, couples who play with cuckold elements during "sex play" use it to sexually stimulate in a non threatening way - as in they don't actually want to cause emotional abuse which seems to be its stated purpose of it in commercial. (ie its just cruel vs playful)
So in this sense I'm not surprised that most of the material we have from Japan for NTR is mostly netorare because thats very similar to how the market in the west generates cuckold porn, because they don't really understand the market. Wife watching is a lot more complicated then just 3 people fucking, but the idea of sharing your partner tends to have this element of "punishment' attached to it because morally speaking a lot of people don't understand it so its classified with a negative connotation.
Put in another way people who generate cuckold porn often AREN'T in cuckold relationships or have a desire to be - but most of the wife watching porn thats made is obviously made by real couples. I think that speaks hugely to the difference and misconceptions as to why this fetish in general is popular.
The thing is WHEN wife watching porn IS commercially created like Marina or other western materials if done well, its outsells cuckold porn by leaps and bounds.
Its interesting you mentioned that a lot of authors are trying to tell stories using the negative emotions of netorare, because often this speaks not to sexual fantasy but a form of physiological punishment and our current society which has more singles and feelings of isolation then ever before. (yes there is a believe this is linked) That said some ARE just trying to tell a good story using netorare as the base too.
long story short netorare will always have more material created for it just like cuckold porn that floods amazon, so we have to enjoy the few netorase we get!