Clearly El Reg didn't use an 850 powered ARM Windows PC (they been fast enough already, long before the 8cX chip in this Surface X). I am using that in a Yoga C630, and its more than fast enough.
The insance 15+ hours battery life, means I can go to an all day waffle fest, and never worry about plugging into the mains
(the main issue being the horrible fat UK 13 amp plug, even if you can get a slim charger)
The biggest issue is software. (and I am resisting moving out of S mode, and keeping the device "Pure" without emulation)
* No Edge / Chromium dev to use (although MS are working on this)
* No visual studio code, god forbid even proper Visual Studio
The Yoga screen also wasn't high enough (Full HD) but these days of 4k and iPad retinas it just isn't high enough.
The Surface Pro X is my dream device (although it is mighty expensive)
If other Windows OEMs can make this for around 1000 pound mark with keyboard/pen all bundled, MS can get those apps out, and battery life is still 15+ hours - then they can "TAKE MY MONEY" :)
Anyone still ragging on ARM Windows in 2019 hasn't used one of the up to date devices, they really are fast enough, battery life is wonderful.
Just need those ARM Apps!!!