Re: Good
"This is the OS changing, not our BIOS/secure_boot code(the firmware), and in any event some third party devs can now jump in and provide a solution to this removed feature"
Perhaps, but consider the option of Microsoft deciding that third party software not supplied via the Windows store is too much of a faff to look after, and removes the "feature" of installing any .exe of your choosing. Basically turning it into a walled garden like the PS3 or an iPhone.
Extreme, perhaps, and an unlikely example, but still a precedent now that Windows 10 isn't a product you buy anymore and expect to work/be supported, but a service that MS can chop and change at will.
Biting the hand that feeds IT
