It exists because it's nice to have a unified place to define all your network connections and their behavior, instead of having them spread across wpa_supplica

It exists because it's nice to have a unified place to define all your network connections and their behavior, instead of having them spread across wpa_supplicant, pppd, mbim-network, dhcpcd, openvpn, vpnc, freeswan, iptables, and ifupdown.