i can understand going through and removing duds but what’s the point of doing any type of tonal or color edit on an uncalibrated tablet in less than optimal lighting environments?
When the overwhelming majority of users, including hobby photographers, don't calibrate their displays, this is a problem confined to a very small group. For that group, there's some who believe the iPad displays are already very close to color accuracy. Others employ some form of calibration app that runs on iPadOS. Most I suspect do some form of what I do: all of the culling, renaming and most of the editing is performed on the iPad. Publication to web is done on the iPad. Closing out the job, keywording and edits on a small group of “keepers” is done on the Mac. Not every image I capture is art that needs a computer for editing. Then there's others, probably a sizable majority, who prefer to do everything on a computer, that's still an option.
The point is people know their needs and wants. For those that do extensive post processing on every image they capture, computers are the current gold standard. For those who remain closer to what the camera captured, the ipad is a viable option.