I think this is a good attempt at explaining the ‘Mary Sue’ issue - and it’s short too!
I agree with his assessment. I also feel there’s a clash of creative choices in the ST regarding Rey. I liked Rey in TFA. She was self-reliant, and even if I felt she was generally just a little to good at everything, Daisy Ridley gave her a vulnurability, that made her endearing. Like many people out there, I expected a good explanation for her sudden Force abilities in TLJ, and thus conditionally accepted them. Except it never came. While the whole anyone can be a Jedi/Rey is a nobody angle seems like a good idea on paper, it doesn’t mesh well with the setup in TFA imo. The darkness rises and light to meet it explanation seems contrived, underdeveloped, and a cheap shortcut in Rey’s development, such that we can focus on Luke and Kylo, and have a ROTJ like throne room confrontation in the middle chapter, which sees Rey being evenly matched with Kylo, despite the fact that she only learned about the Force a few days earlier, and Luke has taught her very little, aside from telling her the Jedi suck. The explanation for her sudden rise in power is just too thin, making Kylo seem weak by comparison, and no attempt is made to make it fit into existing canon. Like the FO’s unlimited resources, and Snoke’s ascension, it’s just pulled out of thin air, and we’re supposed to be entertained enough to ignore the undercooked nature of these story developments. It seems even the creators realized this, when they introduced the idea of Rey downloading the know how from Kylo’s mind in the novel.