much wisdom, for my money, in 5mi11er's "professional training to get the breadth of knowledge...."
My eyes don't exactly glaze over when I'm following a thread where the knowledgeable turn the discussion to some truly CS-type byway, but a little voice says -- "ummm, more to study!" and a second little voice asks "with what for time?"

The second voice doesn't squawk at purely perlish study-time, but gets a tad touchy when deeper knowledge, much as I may want it, gets in the way of dandling grandkids on knee; earning my keep, etc.