Covering a historic event is perfectly legitimate. It's not sneaking into somebody's boudoir... These people belong to history, and not to record that if you have the opportunity would be wrong.
The most awful museums are in China. They have magnificent stuff on display and just the worst way of displaying it. They just don't spend money on lighting and installation.
Professionally I've evolved with what's required, but the pictures I do for pleasure haven't changed, except for the cars in the background, the clothing. I haven't changed at all.
It's almost embarrassing, but I do have one trick for taking portraits on commission. I carry one of these little bicycle horns in my pocket, and once in a while, when someone is sour-faced or stiff, I blow my horn. It sort of shatters the barriers. It's silly, but it works.
In those simpler days, you could just take pictures of movie stars and show them the way they were, as normal human beings. And if I felt part of any movement at the time, it was just to do that - to be journalistic and photograph what is, rather than what is made up.
I don't really have a favorite camera. I use a Leica and Canon a lot. It depends, especially professionally, on the requirements. But my carry-around camera is a Leica.
Now very often events are set up for photographers... The weddings are orchestrated about the photographers taking the picture, because if it hasn't been photographed it doesn't really exist.
To me, photography is an art of observation. It's about finding something interesting in an ordinary place... I've found it has little to do with the things you see and everything to do with the way you see them.