It's still possible to map OneDrive ... but Microsoft would prefer that we didn't.
To Microsoft, OneDrive is considered to be part of the operating system, so files in OneDrive can be accessed directly from Windows. This is similar to the way Google Drive works with ChromeOS. With Windows, however, Google Drive has to me mapped.
You can find directions for mapping OneDrive on the internet, like here: How to map OneDrive to a drive letter in Windows 11 / 10. But to be honest, it's better not to work against Microsoft's design for Windows, so I believe Emily S726 gave you the best answer.