Interesting to see someone else with the same base and thoughts on it, and I'd highly recommend it! At a lower level, I've found a PL/Compilers background lets me switch/pick up languages quickly often and also helps even finding quirks as you can often guesstimate where the bodies are buried from design choices of the language. Also very helpful for architect type roles where you're picking what technologies to build on, consulting experts when needed.

I think the idea of "you have to spend years and years to know the internals of X" is a bit flawed - you can get quite a good feel in ~6 months that's not equivalent but not terribly far off. If you do "height on demand" for long enough, you end up with a good number of these. As someone called it, a "comb" engineer, if you will.