If it wasn't for Wallis Simpsons, Elizabeth wouldn't have become Queen. Wallis Simpson was a divorcee and wanted to marry the King of England (that was a big no no back then). In return he (the King) abdicated the throne so he could marry her, and the King's younger brother got to become the King of England. When he died, Elizabeth took over. We could almost thank Wallis Simpson for getting the first King to abdicate so his brother (Elizabeth's father) could become King.
It might not have been neat and tidy back in the day, but the end result was Queen Elizabeth II, who in my opinion was the best royal ever seen in the last 100 years and possibly the best there has ever been. She was the epitome of how a royal should act, unlike Harry who is at the other end, and Andrew is even lower.
I agree in that without Wallis Simpson we would not have enjoyed such an incredible Monarch like Queen Elizabeth II
However, there is a side to Wallis Simpson & Edward that is alot darker that many have forgotten.
When Edward abdicated in December 1936, he and Wallis went to Germany in February 1937, both were confirmed sympathisers with the regime that ruled Germany at that time. They also financially assisted that regime and that of the Vichy.
For a very long time, especially during WW2, the Royal Family were tainted as a direct result of Edward's behaviour....not just the marriage to a divorcee, which was not legal at the time for the Monarch to do, but that he and Wallis went on to publicly support the very regime who was attacking Great Britain and much of Europe.
The active and public involvement by Wallis and Edward in that regime left a massive stain on the British Royal Family history. Initially it was seen as unfounded accusation and rumour but they themselves actually and openly admitted their support to the regime and with Vichy.
Wallis and Edward were seen as traitors...both to the Royal Family and to Great Britain and Commonwealth
Harry and Meghan are largely seen as the modernised version of traitors to what was Queen and Country, now King and Country in that they have perpetually spread rumour and malice, thrown accusations and insults towards the Royal Family to which, as Her Majesty correctly said was recollections that varied. They have continued to snipe at the Royal Family even after Her Majesty died. And during the services yesterday neither Harry nor Meghan sang God Save The King....something that was picked up on camera more than once. The public...and not just in the UK but across the world...have grown tired of Harry and Meghan, whether it be their constant "woe is me" or the frankly ridiculous claims such as Meghan stating she was told that the people of South Africa danced in the streets like they did when Mandela was freed on the day she married Harry
So the use of Wallis Simpson's car was a very subtle, slightly veiled way of making Her Majesty's true feelings known...something she would never have vocalised as that was not her way of doing things.
Actions will always speak louder than words.