As regards PS on the iPad, it’s not for me. I dislike the subscription model and while I’d like to have both PS and ID on either Mac or iOS I’ve found myself working fine without either. 90% of what I do is within Capture One.
The Affinity options still don’t cut it for me though on the iPad. I do think that Pixelmator Pro is a wonderful example of what you can do on an iPad, all the myriad complex and endlessly finesse-able tools of PS aside.
For me, if I get it right in the camera, I don’t really do much with it beyond the essentials of raw development.