I agree with this take absolutely.
My own personal take on NTR is that I like it done the way Power Vacuum or BoundByLust do it.
They have a switch to allow NTR content that can be changed at any point in the game, and if you have it on, when the specific moment is there you usually have a choice between a few actions, one of which is the NTR path, but it's entirely possible to play the game NTR free. There's also Power Vacuum's standalone "What If" events, but those are made very clear are *not* canon.
Also, again, in terms of personal preferences, I don't really mind a sexual scene where the girl LI has a sexual encounter with someone else before becoming intimate with the MC.
In fact, doing it that way and making NTR avoidable makes me at times at least watch the NTR scene too as it gives me an out that it's not actually canon anyway in my specific playthrough.
About what classifies as NTR though, I gotta ask cause I'm curious about a few specific instances and if they actually are NTR or not.
in Wicked Rouge: You manage a brothel and your girls do have sex with their patrons, but it's just their jobs, it's prostitution, and they remain loyal to you in every way.
In Being a DIK: Arieth has scenes and flashbacks with multiple non-MC characters, but she's clearly established to be the loose nympho. Similarly, some of the frat girls like Rionna are from my understanding implied to still be sexually active, just off-screen, as they're not taken in any way.
Similarly, are games that feature an open relationship *really* NTR? Like Secret Care Cafe or Public Sex Life, where the girls may get loose with other guys, but the MC is never at risk of losing their affection, and when getting done by other dudes, the MC is usually still in their minds.
Sorry for asking stuff about other games in this thread, but I'm still curious as it does partain to the topic of NTR which is still being discussed
To end it relevant, I just hope that if HS tutor implements NTR it's made avoidable, but not in a way like you're missing out if you don't. Like, an alternative scene that's non-NTR at the other choice. That way you can watch it out of curiosity without feeling like you're forced down a path or that you're leaving a character uncompleted because you haven't enabled their NTR.