Icons: I don't get this, they are resizable in a few different ways. Although you can also increase the scaling system wide and the icons are about the same size as on the ipad, I'm looking at them side by side on my surface pro 3 and my daughters ipad. I think this is just a matter of user ignorance, and I don't mean that disrespectfully. Now for something like wifi, you do NOT have to click the icon in the taskbar, simply swipe in from the right and you will get a nice menu that has wifi on it in a nice LARGE button. Once again, and respectfully so, user ignorance.
File system: Apples to oranges, you prefer not having a file system that the user can manipulate. I couldn't live without a file system and the organization it brings, but I require that organization as I have a lot of files and categories and much of that information has to be in multiple formats. But seriously, you can't make a folder to hold all your drawings for that program? Better yet you have all your drawings in one folder that you can use in multiple programs, or if you need to transfer or share, etc. Versus having to open that drawing in a new app and being unable to find it or manipulate it. But once again, we probably use our tablets differently.
Application UI: The programs you name work very nicely on a tablet in windows, so does MS Office just to name another big one. Yes legacy programs can be an issue, no argument there, but at least you have the choice to use the legacy program or not. People also forget there are app counterparts to a lot of windows and other programs, so if you want the huge buttons and simple mode many times it's available and a little research would behoove you. In many cases the "simplicity" iOS users tout many times makes things more complicated with either missing functionality, or having to dig too deep in an overly simplistic UI to find a function. I definitely don't fully disagree with you here, but I think each platform has its pluses and minuses and iOS certainly ain't full of pluses.
Lastly, I fully disagree that windows 10 is designed for a desktop. MS has put a LOT of work into it, if you haven't tried the anniversary update you should. Things like tablet mode, redesigned settings, UI scaling, etc. really make it a VERY nice tablet OS. Let me reiterate for those who haven't used the anniversary update: Windows 10 works GREAT with a touch tablet.
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I do miss some stuff from 8.1. They added a LOT of stuff back in windows 10, and also plenty of new stuff that is better than 8.1. In particular I think Metro IE was much better than Edge, although Edge has improved and now has swipe gestures, extension support, etc.