Now that the poster has highlighted the subject, what do we think is going on with Superman wearing handcuffs?
I mean, is he de powered at the time? Are they kryptonite hancuffs/special hancuffs of some kind? Or is he just wearing them out of respect?
Just accept that this is the direction they have taken.
Then, you can either decide this version isn't for you and stop watching. OR you can decide to enjoy it for what it is - an elseworlds tale.
'In Elseworlds, super-heroes are taken from their usual settings and put into strange times and places - some that have existed, and others that can't, couldn't or shouldn't exist. The result is stories that make characters who are as familiar as yesterday seem as fresh as tomorrow.'