Final Cut Pro Why doesn't it support the iPad Pro 12.9 4th generation even though it supports the iPad 11 Pro 3rd generation?

That is easy to explain - it comes down to the fact that the 12.9" is introduced long before the 11", so the same numbered "generation" does not correspond to equivalent devices.

The first 12.9" was introduced in 2015. The first generation 11" was introduced in 2018, at the same time as the third generation of the 12.9".

The 3rd generation 11" iPad Pro was introduced in May 2021, with an M1 processor

The "equivalent" in 12.9" format is the FIFTH generation.

So:

iPad Pro 11" 3rd generation: M1 processor, from 2021

iPad Pro 12.9" 3rd generation A12X Bionic processor, from 2018

NOT the same thing.

I was going to go look up all this technical info, as I knew what the issue was. But then my dog grabbed a toy and I had to go play with her, so, you know, business before pleasure... until you're retired...

Ben

In case you are not familiar with it, all this and more information about a myriad of Apple products is available always directly on my Mac from the Mactracker application.

It is amazing how a free application is still frequently updated with info about new macs and devices, after more than 20 years. I am grateful.