> That's like saying my C# is getting turned into CLR bytecode, so I do have to learn CLR bytecode because I have an abstraction over it.

For a good part of your career this is true, but eventually you will need to justify your senior salary by being able to debug react via looking at library code itself, or understanding the event bubbling under the hood, or figure out why the output css isn't working.

Saw a video, wish I could remember who, someone developing a game in c-something. There was some bug they couldn't figure out so they jumped into I guess the assembly for that block of higher abstracted code, and was able to find some kind of memory issue. Vague, sorry, but point is I remember being really impressed, thinking oh shit yeah if I really want to be an expert in my field I better be able to really understand my stack all the way to the bones.