What technology or data structure do you think developers don't understand if they work on React projects?
Isn't it silly to claim any person is suddenly incompetent just because they are assigned to a project which uses a particular framework?
These days, the people who could do the above can instead do it better (and in much less time) with jQuery. However, the people who previously couldn't do it at all in any reasonable amount of time, can now also do it with jQuery... poorly.
There's a middle (the people who would struggle with the low level but are proficient enough to do a good job with jQuery) but they are, in my impression... not a majority.
I believe that's why most sites (especially non-tech e.g. Chase bank and Amex) and many Electron apps (Teams, Evernote, ...) are such bloated, slow, glitchy monstrosities. Well that, combined with what the top comment said about the money
Having written JS full time for 15 years most JS developers are deeply uncomfortable navigating complex data structures of any kind. There is a deep emotional reliance on declarative APIs to do that for them. This is a skill super foundational to programming in any language learned from experience, but in modern JS the reliance on tools fails to foster those very necessary skills.
This is a challenge to describe to software developers who have no experience writing original software, such as without a framework, because they have no frame of reference to consider alternative points of view. People might find it challenging to explain modern astronomy to tribal people living in a jungle, for example, because the necessary intermediate education is absent.