I can see the bad connotation being "fair" when it means "dumps current partner when someone else comes along", because it doesn't seem very respectful of your partners. In other cases though, I don't think it's inherently bad.
I also don't think the "leave a partner when another one comes along" is limited to monogamy. I've certainly seen people have a primary partner, and deal with secondaries in a similar way, being, I guess, serial polyamorists of some sort?
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