I do photography and videography too and wondering about how all the new features will work out. I currently have no desktop, just a MBP and an iPad Pro. But I'm wondering if these features work out that maybe when I take photography trips, I can just take my iPad Pro in which case I could get an iMac desktop with more power for editing.
I think that's exactly the case and I will be testing it on some trips in the future.
If I need to do an intense edit, of course I'm going to stick with my MacBook Pro. But if I'm going on vacation and I want to edit together a short video and tweak some pictures in Lightroom, hopefully I'll be able to take just my iPad.
I already tried plugging my Canon M50 directly into my iPad with the USB cable and it imported perfectly (iOS 12). From what I've heard so far, in iPadOS 13 you can directly copy files off a camera into a folder on your iPad so they don't show up in your Camera Roll.
I guess only time will tell!