Oh yes I agree with this. Social media and the Americanisation of British culture in general tends to superficially collapse the distance between our two cultures, but in actuality we are very different and so Kate would have been able to grasp the RF's historical status more easily than Meghan. Meghan, however, likes to make much of her intellect, so she would presumably have been capable of learning.
The other thing Meghan failed to grasp about royal life (and I suspect Harry failed to teach her) is the unique (and frankly eccentric) social contract the RF has with the British public. It's not one of straightforward admiration at all. We agree to finance and support the RF, and in return we're allowed to vocally criticise them and even make fun of them (satire and mockery being a far more ingrained part of British social and political life than it is in the US). We also don't want them to talk too much about themselves. We want them to act as a cipher through which they highlight the achievements and struggles of ordinary people (which is why they visit hospitals, schools and community endeavours).
This is a world away from the lofty heights of American elite celebrity - the Obamas, the Oprahs, the Kennedys. They are treated with much more respect and straight out adoration. That's what Meghan thought she was getting through the RF - lofty elite celebrity through which she could sprout her word salad and be praised, never questioned; could wear as many different designer dresses as she liked and not be subject to snide remarks about the cost.
It's significant that the UK press was hagiographic about Meghan UNTIL she took private flights on Elton John's jet shortly after a speech about climate change, and wore a vast array of extremely expensive dresses. The media did what it does for ALL RF members - poked fun about hypocrisy and complained about the costs. That was to be expected and they'd have done it for any royal member because Meghan had broken the unique contract the RF has with the public which I described above. But because Harry never taught Meghan about that contract, she misinterpreted it as racism, and Harry ran with it, and thus the path to their exit was set.