Part of why I am polyamorous is that I enjoy experiencing all kinds of connections people can make. I like short-lived relationships and commitment for life, loose and casual ones just as much as deeply connecting ones that end up intertwining my life with someone else's irreversibly.
I like not having to go through the hoops and motions of 'standard' traditional relationships with a clearly defined dating phase, 'going steady' and all that. My partner(s) and I just do what we want and what we like, whether that's a deep friendship with a romantic component, a loose kink adventure or a non-sexual but highly romantic marriage-style commitment. We just do what works for all of us.