I'm a hobbyist photographer, and I do the vast majority of my photography work on a 9.7" iPad pro, with a Pencil. I'm constantly editing 24mp RAW files in Affinity Photo, which is about as close to full-fat Photoshop running on the iPad as you can possibly get, and let me tell you: It's fantastic.
I turn on my camera, I shoot some images. I open up Cascable, which connects to my camera's wifi, and I pull down some images. I flip through them and find one I like, the one I want to edit, so I click on that one and click "share", and then select Affinity Photo.
Affinity Photo opens. It's 95% of the power of desktop photoshop, albeit organised in subtly different ways. I do the things I would normally do: White balance, HSL, blemish touchup and even frequency separation. I click export, and save to camera roll.
It's in the camera roll, and I select it, and I share it over email to some friends, and to discord, and to instagram.
I don't get where the problem is.