The relationship was a toxic one by all accounts. Even as an American growing up in the 90s, it became common knowledge that the Prince and Princess of Wales had a pretty bad relationship even in the 90s.
It was a relationship ultimately built on the idea of Charles having a suitable mate and that mate giving him heirs.
Ultimately, she fell in love with a man who was in love with a married woman , and a man who also resented having to be in a relationship with a woman, he didn't love for the sake of the crown.
At the same time, he carried on the affair after wedding, and Camilla was always a presence.
At the same time, she was expected just to put up with it by the Royals. No, the Royals didn't approve of the would be King carrying on with a married woman, but at the same time , there was a sense that Diana, like alot of wives of Monarchs and politicians , is just supposed to put up with it and stay silent.
She was a very young woman thrown into a machine and institution that was very much stuck in the 19th century, while Diana was very much a 1970s and 1980s young woman with beliefs and ways of expressing emotions that conflicted with the Royal image and comportment .
Now , she did have affairs in kind , and she did have all kinds of issues which she talked about in interviews and which her close confidants talked about . She also eventually learned how to play to the press, though alot of her more media savvy moves we probably won't see until Season 5 as we get into the mid 90s.
I felt the series gave a pretty clear view of who Diana was with her strengths and her flaws at least in season 4.
She was a charming and charismatic person who was not only popular in Britain, but her in the US. She did wear her heart on her sleeve which made her more relatable than the other Royals who came off as stiff and distant. It was her empathy ,and her grounded attitude which is why she was dubbed "The People's Princess".
Now Charles of course , didn't come off as well, but then again, his antics , behavior, and feelings about the Marriage and Diana during this period, that the Crown has shown ,really aren't that far from reality.
Season 4 does take Diana's point of view in terms of the relationship, no question. Then again, no one at the time, or even so much today , really defends Charles's actions back then, and even though he and Camilla are accepted as a couple today, how they got there isn't exactly consider a shining moment.
. Overall this was pretty great. The acting was phenomenal as always. Olivia Colman was even better than the last season. As were Erin Doherty, Josh O’Connor and Tobias Menzies. I don’t think I loved Emma Corrin and Gillian Anderson in their roles as much as everyone else seems to have but they were still really good. It’s so strange looking forward to the next season and the new cast while at the same time being sad about this cast leaving, especially since I miss the old one still 
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