I did understand the problems she faced, but, like Meghan, she didn't fit the role - unlike Meghan, Diana did try quite hard for a while, but she didn't click with what Charles needed, and she did OK with the formal bits. I thought everyone knew that she was said to have had had several affairs before Charles reverted to Camilla. The tragedy is that Charles and Camilla should have married when young. They are obviously still in love. I don't really blame Charles at all.
It may clarify my feelings if I explain that my old headmaster (northern Grammar School) retired to Sevenoakes and ended up doing a bit of part-time teaching. When we met him at a school reunion years later, it transpired that he had taught Diana (she was only a couple of years into her marriage then). Naturally I asked his opinion of her. His response (remember this is an M.A. Cantab. with many years teaching experience) was that she was 'sly, manipulative, thick as two shorts and not worth half of one of you'. That is simply as I report it.
You can work out whose side I'm on! Camilla is, I think, a decent woman and supports and loves Charles. He is obviously happy and has blossomed in his ventures. What happened to Diana was sad, but she brought a lot of it on herself i.m.o.. I put a lot of blame on the Establishment and Prince Philip for the whole mess, but I do think that Charles was the victim of circumstance in many ways.