Most non-geeks aren't going to regularly right-click or Force Quit an app. They hit the red button. The similar red button in Windows actually quits the app in one step.
Yeah ok but this is absolute basic computer usage. MacOS also has the dots to let you know it’s still running turned on by default. Also, Windows 11 just added those, and made it harder to open Task Manager. Right click icon -> close works the same on both.
Besides all that, it’s not universally true that hitting the X quits an app on Windows. Many applications use a notification area icon to stay running. Granted, most Windows users don’t know that either. Also, File->Quit is remarkably similar to Application Name -> Quit.
It’s always hard to say what “users know” because they’re all different.
My only point is that it’s not actually any harder, just different.