FWIW, I'm not just trying to be argumentative -- details clearly matter.
Many people (whether someone living in a manner that everyone could readily agree is indeed polyamorous, or someone reading about it in the popular media) seem to have a questionable understanding of its underlying & necessary nuances. As a result, polyamory is seen as another form of kink, or interchangeable with swinging, or requires (not merely allows) subterfuge, or the same as hierarchal nonmonogamy (like most polygamy), or is anti-monogamy.
In part, when faced with such misunderstandings I generally prefer to just roll my eyes, & move along as necessary. On sites such as this, though, I find it difficult to turn a blind eye to the outfall from these failed apprehensions. Worse, people latch onto them (often in a self-seving manner), blast them across Facebook & their blogs, & even enshrine them as Truth in published books & science journals.
"Knowledge and consent" is cut and dried.
Oh, that it were so easy! Something so simple & obvious falls apart with very little prodding. On the one hand, it can readily be interpreted as saying that I've got to run around & get permission from everyone I'm intimately involved with (emotionally, sexually, financially, residentially) before doing anything intimate with another person (certainly getting approval before doing anything new!).
Contrariwise, it can also be interpreted that I simply have to let everyone know I'm nonmonogamous; this allows DADT (which would otherwise be a deal-breaker) to exist within polyamory.
(People have repeatedly tried to sneak in the notion that we have "emotionally intimate relationships" with our kids & siblings & parents etc.; does that mean we can only be poly if THEY know?)
And I get the impression there's lots of people who can't differentiate "consent" from "assent," thereby validating the notion that (say) my spouse doesn't really have any more say in the matter than I wish to grant her -- she wants to stay married to me, & can't really do much to stop me anyway, so she remains silent. Assent, not consent.
I'm also going to have to argue against polyamory being "an ability to form multiple relationships." There seem to be plenty of people who likely have the
ability to carry out a high standard of nonmonogamy, but don't see much reason to do the heavy lifting of learning HOW to do it, much less do it WELL, so they merrily run roughshod over the core concepts yet claim the title & indeed feel fit to pronounce upon others' intimacy.
Conversely, being "poly-able" includes people who are entirely unaware of even the concept but might somehow be objectively validated as having the necessary skills or emotional maturity or whatever to be good at multiple relating should they ever drift in that direction.
Mostly, it's
relationships that are polyamorous, not the people in them. Upon gaining hands-on experience in polyamory, those individuals will view the world in a different manner, even if they give up having multiple relationships, & I suppose in that sense might "be poly" even if they've stopped being poly. In a wider sense, though, people aren't actually polyamorous.
Even "poly relationship" needs much more solidity. That Newsweek blog claimed there are ~250,000 "poly families" in the U.S. ... but it's never explained WTF "family." If a woman has four ongoing lovers, & none of them is involved (or wants to be) with anyone else, then she can be said to have a poly relationship with them, but I can readily argue that THEY aren't themselves "in a poly relationship." And let's say that I'm married & we're both actively nonmonogamous, & one of my years-on lovers is in a similar situation, & we're separately domiciled -- is that one "family" or two or maybe three? How does my wife's married boyfriend affect this number?