Maximum number of joystick analog inputs on Windows, flight sims?

I am getting conflicting information regarding the number of allowable analog inputs that can go into an Arduino-based joystick on Window.

I would like to have 9, but there are apparently limits to 8 on many flight sim programs?
Maximum number of axes allowed in a custom controller? : flightsim (reddit.com)

The Arduino Joystick library by MHeironimus seems to support more than that:

And it seems people have pushed high limits on Teensy:
Many axis joystick (pjrc.com)

So is the limitation on Windows? On applications? What about Microsoft Flight Simulator 2020? How many analog inputs can I create on a SINGLE device?

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