Yeah, I get what you are saying, but someone like E. L. Byrne has multiple committed relationships (3 or 4)and is still in the ones she had in Berlin even though she doesn’t live there right now. So, the sex part will probably resume at some point, but that’s not been a part of those relationships for long while.
And there is plenty of poly that doesn’t require fidelity to the relationship. In fact, I think that’s probably the norm because it’s also kind of the point. Closed relationships are fine, obviously, but I don’t think they are the norm. From my point of view, if you’ve been sleeping with the same person for any length of time, feelings will develop and so someone who has been involved with someone else for more than about 8 months or so is probably more than a booty call. Again, just my take on things.