> It’s not like reading 10 bullet points on the subject is “diving deep” and making huge time investment.

True, but you're using so many abstractions that the rule can't feasibly be "read a short summary of every abstraction you're using." There are just too many. At some point you have to choose a threshold where the likelihood of an abstraction leakage is sufficiently low. When you're debugging a CSS selector you will almost certainly never need to know about even the existence of, say, Fermi–Dirac statistics.