The point is that an Android/iOS devices generally does its job nigh perfectly, whereas a Windows tablet does its job flakily. My SP4 will lose connection with the pen, requiring me to restart the pen by taking the battery out and putting it back in - never had any pen troubles with my Samsung Note (of course, as its Wacom tech). I have auto-hide on the start bar, but then it frequently won't come up when I drag from the bottom of the screen, requiring me to pull in the right-hand side bar, press Network, and then the bar will pop up. The on-screen keyboard doesn't always come up when you press in a text-box, requiring one to manually bring it up by pressing the option button on the start bar. So worst case, which I had the other day, you click in a text box, no on screen keyboard, try to drag the start bar onto the screen but that fails, drag in side bar, press Network, start bar appears, press on screen keyboard, press the textbox you wanted to type in, get to type. All the other devices, a textbox press brings up the keyboard without fail.
There are many niggling usability issues with Windows 10 where the rival OSes have been solid since launch and just gone from strength to strength in terms of features. MS haven't anywhere near the same level of quality and polish for their OS as they have their hardware. Which is ironic considering we've always considered Sony a hardware company and MS a software one!