The good news is that if you wanted to use the iPad as a secondary display for your Mac, a device and app called Luna Display might be of interest to you. The device was originally launched on Kickstarter where it was successfully funded, and basically what it consists of is a dongle that is connected to your Mac, and software on your iPad that transforms it into a secondary display.
According to Astro HQ, the creators of the Luna Display, “Software apps literally hack your graphics card, delivering a glitchy and unreliable picture. Software tricks your Mac into thinking a display is attached, when in fact they get no benefit of graphics acceleration or Metal GPU support. Luna harnesses the raw power of your graphics card, giving you the full benefit of its graphics acceleration.”
There are several ways to turn your iPad into a secondary display, as well as various apps that have been in the market for a while now. This means that for $79.99, there are plenty of cheaper software alternatives. However whether or not the Luna Display will work better than these apps remains to be seen, but if you’re interested in checking it out, head on over to its website for the details.