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"Apple makes fast Windows PC" -Gearlog
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There are thousands of programs and devices that work on Windows. And you expect them all to work perfectly on the new version regardless of the version they were created for. The huge bloated codebase they have to use from one version to another is mostly stripped down from past versions so that those programs and files work.
Most PCs are powerful enough to do that without causing problems. Maybe even have the old OS install at the same time but entirely seperately.
New Windows goes into a Freeze type state and the old one boots up and runs the program. When the program quits you're back into new Windows.
Quite probably a coding nightmare but it's more or less a solution to the problem of old code.