how about using your Mac as a monitor for an IPad?

Yes, but you can, but only to mirror an iDevice to a Mac

You can use QuickTime to mirror your iPad to a Mac

Use Airplay on an iPad and Mac, if a Mac is new enough.

You can use Airplay on iPad with third party apps, such as Air Server, AirParrot, Reflector as some of these apps have both Mac and PC versions.

It can be done.

Hello,

You are welcome to share your feedback with Apple using the following link.

Product Feedback - Apple

You’d have mirror it.