For most consumers it doesn’t matter. What will is “Why does program X run so slow when program Y is fast?”. That can be solved with marketing, like calling the ARM version of Windows “Windows M 11” or something like that. Programs optimized for “Windows 11 M” will run faster and older windows 11 programs will run, but slower. Explaining that will be key to whether Arm windows will succeed.
Most users though use a small subset of programs. Like web browser, email, light office and some media consumption. Should work well enough for them.