Please stop parroting this FUD. After Windows 10 stops getting supported, Microsoft won't come in your house and throw away your PC in the dumpster or have it stop working for you to have to throw it away. You can keep using it like before.
People don't throw away hardware just because the software stopped getting updates. Although not recommended, there's even people still using Windows 7.
No, they will just cut off security updates. They will then steadily make subtle changes to the OS to ensure new software won't ever run on your old machine. Then the day comes when whatever new tool you need to do your job just will not run on your old machine. Then you dump it and blame yourself for the waste.
I tried to give away my old laptop to a charity. They wouldn't take anything more than four years old, and nothing that wasn't running windows 10. Anyone want a free laptop? I've got one sitting in the closet that I cannot seem to give away.