Time changes everything. Everything is done differently during different eras but some things don't change as much. You know, like a masterpiece painting, like the Mona Lisa.
Not just art has changed. Let us look at more recent changes that I am sure most of us can remember. Take the reaction to bad grades back in 1969 (or before I graduated in 1961) by the parents to the reactions of parents today:
Then of course divorce is quite common today, where as back when I was a kid it was practically unheard of except maybe a few in the motion picture industry. This greeting card would never have been seen way back then: