I don't know anybody that does serious work on iPads. Every quarter there are only ~9 million iPads sold for every ~34 million Lenovo/HP/Dell laptops and half of those iPads have got to be for kids from what I can see.
Sure, an iPad is fine for consuming documents and doing light markup. However, if you're going to create things you're going to need to be multi-tasking and - hey, I have multiple iPads and I use them all the time - but I'd love to have a contest between what I can get done with Windows/Linux versus what you can do on an iPad because there's just no comparison as far as I can see.
I'll add macOS to that too. It's not even in the same class as Windows/Linux. I watch people using macOS daily and I swear, they are constantly swiping to find that full-screen app they lost because of the complete lack of window management in macOS. They'll put Chrome into full screen and then struggle to get the detached devtools window back up. They'll have to install things like iTerm with it's own tiling manager, to manage 3 terminal windows. Apple just doesn't care about practical things, they are constantly focusing on how things look, how thin or light they are or how they can make the most amount of money by removing options and claiming everything is always better that way, when really it just serves to remove the amount of work they have to do to support things like you know, physical buttons, headphone jacks, options/modes in software and so forth.
Anyway, the UI in Windows 8 and 10 were also completely configurable to make it more like the original Windows UI. If you don't like the default configuration you can change it or install 1 program (7+ taskbar tweaker) to make it just about perfect. What I really, really like is being able to do things the way I want to do them and not the way some godless corporation has decided it should be. Apple just gives you nearly zero choice compared to Windows and most obviously, Linux. They're just on the wrong end of the spectrum for how I like to do things.
And I never got any ads on Windows - just pre-installed apps like Candy Crush and Skype. I'm assuming they installed Candy Crush because it's a lot, lot more popular than Solitaire or Minesweeper with today's crowd. This is no different than Apple pre-installing things on macOS/iOS. And before anyone says anything about Apple not pre-installing 3rd party software...I think that's incorrect. If you want to use any of the Unix aspects of macOS, you have to start off with Apple's lame and old versions of even basic Unix utilities and programming environments until you go and install some other 3rd party things to fix the situation. That's way worse than having to right-click a Candy Crush icon to remove it once IMO.
Pressing Start is one popular way of starting a program on Windows, so I don't understand that line of argumentation.