This was around 2017, most students didn't become React devs. Most students did end up in the JS ecosystem, but 30% did something else [1].
[1] When I say 30%, that's not an official statistics. It's just on my impression what I've personally seen from students who connected to me on LinkedIn. It's a guestimate at best.
For example, I never really had to know how a compiler works or assembly, but I know it. I only needed my data structures and algorithms knowledge once. My knowledge of UML? Meh
And so on
The problem with _aiming_ only high enough to create technicians, though, is that you create a good chunk of _operators_, instead, who make do with both thin _and shallow_ slices of knowledge, making them poorly suited to any kind of generalization.
But yes, to anyone in a boot camp, get yourself some Khan Academy or whatever you need to get the fundamentals. This is an art, a science, and a craft, and you need to study to show your pride in that craft.