Not only xlr ,Speakon and Powercon are better than any IEC plug or speaker connector. That's what I call contact security. You can use them to lower your speakers and equipment from the first floor if you want.
Not an issue in a home system though, not sure how many times your gear gets accidentally unplugged while in operation? what we really care about it contact resistance and for that, a binding post + spade is actually measurably superior. For power, a pure copper plug and receptacle are superior to the brass used in powercons.