I find that almost all devs have a layer at which they don't understand what is going on. Everything we do is built on the shoulders of giants, as evidenced by how little we think about the 0s and 1s that are the actual end result of our work.
So I don't see a problem with any dev having a line of non-understanding as they work. Some peoples lines are lower than others, but we all work that way. So it is all good.
> how little we think about the 0s and 1s that are the actual end result of our work.
but that doesn't mean you don't understand it.
You can get away with not thinking about it - for example, the error correction algorithms and protocols in tcp, or memory access - and that's because the designers of those layers have thought hard and long about how to keep it from leaking.
For js ecosystem, the designers (?) didn't think much at all. It is hobbled together rather haphazardly over time. Leading to the mess today.