There are a lot of known problems... but there are also a lot of unknown, or at least unrecognized problems. Some of those unrecognized problems are going to be more useful and higher-leverage than recognized problems. The same "being a sponge" approach still helps.
I find there's some overlap between being good at Root Cause Analysis and realizing that 3 of your most common problems are really all a 4th problem, some aspects of which have not hit you yet.
