I don't want this kind of connectivity between my phone and PC courtesy of MS.

I already have it via VPN and just use either RDP or (like you) SSH. It's easy to send a "shutdown -r -f -t 0"

Hell, I have shortcuts on my phone to reboot my personal machines - laptops, VM's, even my ESXi host.

MS over here acting like we haven't been able to do this for years with off-the-shelf tools.

Also, who shuts down boxes these days? That's what power management is for. If you left it on, I assume you wanted it on.