If they had a screenshot review process then people would be annoyed they had to wait for screenshots to go through review, same as they are now.
Basically, Apple is more interested in protecting their customers than they are about making developer lives easier. As a developer, that's annoying, as an Apple consumer the fact they're taking steps to block scammers is a net positive.
I'd rather wait 1 to 2 days for a quick screenshot review process than 2 weeks as it is now to submit a new binary (and waste the reviewers time for having to review a binary that is actually the same as the previous version) just to change my screenshots. Also, users will then see a pending update for the app, which they will then have to waste time downloading.
Who says it'd be 1 to 2 days for a screenshot review process? I can't see Apple dedicating a team to it, they'd probably dump it in the same queue as app submissions, and whilst a screenshot is significantly easier to test ("Does it look like the app? Yes. Done"), it's still going to not be a one day turn around.
It's a crappy solution to a crappy situation basically.
Dedicating a team? They'd probably outsource it to some business services company.
The real root of the issue is, why do apps called 'Pokemon Yellow' and 'Halo 4' get approved without Apple checking to see if they are published by the rights holder?
Basically, Apple is more interested in protecting their customers than they are about making developer lives easier. As a developer, that's annoying, as an Apple consumer the fact they're taking steps to block scammers is a net positive.