Ugh. Yet another "wonderful" (in a perjorative sense) "new" tool - like systemd, that creates yet another thing to remember. Systemd is why I pretty much stopped growing the use of Linux in my household. A much better approach would be to modify ifconfig to use the newer API if available, and perhaps extend it to handle name spaces, without creating yet another <insert expletive of your choice> new command or tool.
I second that.