Why aren’t there more native command line shells for Windows?

To my knowledge, the only native command-line shells out there for Windows are:

  • Command Prompt
  • PowerShell

I know there are others like Git Bash and Bash with Cygwin, but those require tools like Cygwin, MinGW or WSL to function and besides – they modify the root directory to have the Linux file structure and then “mount” the Windows drive. Are there any other native command-line shells for Windows? If not, why not?