I have not booted directly to desktop, but I have seen a lot of articles saying they know how to do it. Also, I upgraded a slow retired system and found it now to be useable and quite fast. So if you had a computer like mine, you would also had to buy a new laptop and then do all the steps to clean out the Windows 8.
Even if you don't boot directly to desktop, you could wipe out all the tiles and just leave the desktop tile, add the third party Start Button and uses the included program (I forget the weird name) that allows you to bypass the login and guess what you have? You have a faster, more responsive O/S that presents you with one tile that says Desktop, which you can bypass if you want or just click on it. It would be faster to do that configuration than to redo your entire system to an older O/S. I think you are making a mountain out of a mole hill.
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