The point about Diana is - the RF knew Charles did not love her.
He knew he did not love her ('whatever that means').
Just because people left school at 16, doesn't mean they were any more mature than your average 16 year old today.
It's not infantalising to say that the age gap was remarkable (as in, it is to be remarked on). Charles was 32. 32! Diana thought she loved him, She was 19.
The point is, she was never given a choice by the RF or Charles. If they had said to her, look, this is all a bit of a con. Charles isn't allowed to marry Camilla, his one true love, but if you turn a blind eye, give it a go? Literally - there will be three of you in your marriage.
She only realised what was going on re: Camilla when it was too late ('you can't back out now, your face is on the tea towels' as her sister famously said).
Her step mum was dysfunctional, her dad was unwell and partly paralysed from a stroke (and fiercely loyal to the Queen). Her mother was a 'bolter' who lost custody of the children. She was hardly likely to advise Diana to do the same.
Her siblings were either too young (brother) or too silenced/institutionalised (sloane sisters) to help. They were the put up and shut up generation. There was no support network there (not like Kate has for eg with her solid family).
Today's 19 year-old might have snapchatted her friends for immediate support - (ngl, think he's cheating on me, omg)... taken to social media, hashtagged her way out of it, even gone on MN! (I think my fiancee is still in love with his ex....).
That was the difference in the 80s. There was no 'global village'. No support network. There was just the press - who had all bought into the narrative of fairytale wedding.
What is a 19 year old to do in the face of that and the RF (an institution, as Meghan has found, that have rules so archaic and impenetrible not even Harry - a love match - can - apparantly - navigate for her).
Ha, OK, rant over - obviously I'm basing my truth on The Crown, Andrew Morton, Diana's interviews and probably the gospel according to Paul Burrell.
But that is is the vibe I get from the whole Diana debacle. I put it to the jury that this account is as valid or as based in truth as the alternative optic of 'Diana knew what she was getting herself into'.
I rest my case.