Comment by brianolson

Because it's hard and non-obvious. Nothing in the real world works this way (including computers). It's mathy, it's hard like math, it's beautiful like a proof, but that only works for the small subset of the population who want to be mathematicians. Maybe there's some brain structure thing where this works better for 5% of the population. Maybe their biologically wired implicit grammar processor in their brain is a little different. Maybe in the next century we'll find a gene for 'functional programmer'. But it still just doesn't work for the majority of people. If it works for you, rock on with that for your solo work or find a group of likeminded people and do something with them, but I think it's just not going to have appeal to most people.