I think the problem with saying the women's matches are shorter, so they should get less, is that it's not just about the matches, or tournaments. They still train just as hard to get to the tournaments as the men. It's like saying - should Usain Bolt get a smaller medal because he only runs for 10 seconds- and a marathon runner runners for 2 hours plus. They train the same.
At least, that's how I justify to myself- although it happens far more in the women's matches, than the men's that you get very one sided results. Is it right that Pliskova lost 6-0 6-0 in Rome- and got the same money as Djok?
I would hate to see the end of 5 sets at the slams, it's what makes them special.
I don't really know the answer. 