It's frustrating that this is another area where macOS is way ahead of iPadOS running on the same hardware. I have an M2 Mac Mini that I run as a headless (no display) home server, and I can just open Finder on my main Mac, upstairs, and then seamlessly remote desktop into the Mini, using the peripherals I have in front of me. No third party app required.
There's absolutely no reason this couldn't also work on the iPad, except for Apple's stubborness. They could just disable touch inputs for the remote desktop display if they're THAT committed to never allowing anyone to use a touch interface in macOS.
It's truly bizarre given what they just announced.
I can put on a Vision Pro headset and seamlessly connect to my Mac.
I can get on my Mac and seamlessly connect to my iPhone.
I can't get on my iPad Pro and seamlessly connect to my Mac, and if it's headless, it's even worse.
Here's the really funny part. I can get it to work by plugging a USB-C HDMI capture dongle into the iPad and running Orion to make the iPad the monitor. This way the Mac has a "monitor" and allows sidecar to work. But I have to use the keyboard/trackpad from the Mac Mini.
I can also use Screens, but it's laggier than Sidecar. What I really want is Sidecar to a headless mac that I can activate from the iPad without having to disable stuff and use shortcuts and other craziness.
Or I'll just give up and buy a MacBook.
😮💨