I wonder why, after downloading and installing the GitHub Desktop application I should use my GitHub account and password to connect the client to GitHub (with

I wonder why, after downloading and installing the GitHub Desktop application I should use my GitHub account and password to connect the client to GitHub (with no other way available)? Would it not have been better if GitHub Desktop was a seperate application that gets permissions (for example via OAuth 2.0) as an application in the "Authorized applications" section of the GitHub profile? Or am I missing something here?