I guess I see freedom and commitment as something that can happily coexist. For me, commitment is not about how much time I spend with my partner, but about how much I devote to meeting my my partner's needs. I think that can happen while still being open to the possibility of new partners. Of course, the decisions I make about involving a new partner would be balanced against whether or not I can meet the commitments I've already made and the potential commitment I make to my prospective partner. But I believe that freedom is about being trusted to make those decisions for myself without having to set an outside limit.
I see commitment as so much more than just deciding to be exclusive. I know many partners that have those limits and yet the level of commitment they have to each other is arguably low. I would hope that when I commit to a partner, they would trust me enough to know that I can have that freedom to be open to possibilities yet will be able to make all those decisions based on honoring the commitments that I already have. If I feel poly-saturated- that any new relationship would mean having to devote less to my current relationships- then I would probably not want to include anyone new. But I also recognize that those things can change. My commitment is about my devotion to that relationship, not in about promising not to have more relationships.