This is an interesting thread for me as in a few days I shall go and see my mother's body.
I was with my father when he died so the issue of whether to see him later didn't arise.
Because of the post- mortem, by the time I see my mother over 3 weeks will have passed since her death. I know that in addition to any bruising as a result of the post-mortem, she also had facial injuries as she fell shortly before she died - though the undertakers will probably have put some make up on her.
I am very clear that I need to go and see her because I need to fully understand that she is dead. I don't want to just see a closed box prior to her cremation - because part of me will just indulge in magical thinking. (Perhaps there was some mix up? Perhaps my mother is alive somewhere?)
Because her death was sudden I also didn't see her in the weeks immediately beforehand. There was no farewell visit and our last conversation was very brief and routine.
Neither of my brothers wish to see my mother at the undertakers. But I am happy to say that they support me in my planned visit. I also suspect that if I'm able to say things like, 'She looked peaceful, 'or 'Somehow though it looked like her, it also didn't - so now I understand that she isn't with us any more' that will be helpful to them.
Out of the three of us, I was also the one who felt it was important that the undertakers dressed her in the clothes that she liked to wear in her daily life - a blouse, cardigan and skirt.
I think most cultures want to respect and honour the dead. My background is German Jewish and one of the features of that culture is that the Jewish dead were not respected. They were referred to in dehumanising language. They were 'Figuren' (figures) not people.
In general, I'd say that if you love somebody, you try to give them space to do what is right for them - even if it is not what you would do yourself.