Thing is it would be one thing even if the Professional edition had the ability to take full control without resorting to messing about with GPEdit (which they seem to be treating progressively with the same attitude anyhow and probably will have limited ability to take control in the future) but nope - begs the question of why the Professional edition even exists really.
Recent events have shown that Windows 10 isn't really any more secure - there was that Defender exploit for one which seems to have been brushed under the carpet a bit but is kind of concerning - at the end of the day there are far too many end users who will just hit ignore on security prompts, etc. and end up with malware ridden toolbars and the like no matter how much MS tries to enforce security and the OS is still a long way from the kind of admin/normal user setup of Linux and the likes. If they really cared about security they'd properly split off security updates again and make them quicker and easier to install while allowing people to put off feature updates until required/they felt like it.
Much of your talk about "theoretical" stuff doesn't actually work so its daft of MS to push it - its a nice idea that breaking the system to fix it by forcing hardware/software manufacturers to up their game in terms of driver releases, etc. but time and time again its been proved that approach does not work and even then its almost impossible not to have the odd unintended bug, etc. get through.
I'll refer back to what happened on one of my systems after a recent update:
I dunno how it even managed to get that mixed up - the entry on the left says Overview where it should say battery - the percent left and hours have got mixed up, there are sliders where a status should be and text saying slider connected to a checkbox where a slider should be, etc. - it is basically the Ralph Wiggum of OSes when you peel back the layers - looks OK at first but when you take a closer look you realise its actually pretty badly broken inside.
There are many good ideas behind Windows 10 but the execution and implementation is just plain poor and should be seen for such - trying to defend the heap of **** that Windows 10 largely is doesn't do anything towards getting it improved and actually good in the future.