[BWStearns]

I find the high density makes debugging easier (up to a point) when combined with immutability. Being able to quickly stub/swap out a referentially transparent branch of the code while knowing you haven't more broadly changed behavior can be really useful. Also code density means you're more likely to be pointed to the line (or within a few lines) of where the actual problem is. This may be personal preference but I'd rather debug 1-5 dense line than 20-50 sparse lines given the equivalent code quality and functionality.