Says who? And for what reason? Using Windows 7 in a home environment, I feel like there is no reason to ever upgrade the operating system. I know everybody likes to beat the "improved security" drum over and over and over...as one of the "Oh My God!!! I must upgrade to Windows 8 NOW to be safe!!!" theories. I think Microsoft had a meeting where they gave that bullet point to their employees after they realized what a catastrophe Windows 8 was right after launch.
"Okay peeps, here's the deal. The sales numbers for Windows 8 are abysmal to put it mildly. People aren't being compelled to upgrade to Windows 8 out of want. So, were moving to plan B. We will compel them to upgrade out of fear. Hit all the forums you can...hard and fast. Yes, the same way we hit our loyal customer market with Windows 8. Hard and fast people. Move, Move Move!!!".
Phhhfffttttt. Backup data that you cannot afford to lose, and you should be okay, as a home consumer anyway.
Honestly, if I WAS going to upgrade to Windows 8/9 I would install one of the 3rd party Start Menu replacements after seeing the Frankenstein monster that they have brought back to life in Windows 9. At least they "appear" to have soft corners from what I can see in the screenshots. All those damn square corners are way too hard on the eyes. Should have left it in it's grave for Gods sake.