To me, that's the big hand wavy thing is that that thing where if you just do the straightforward obvious thing it's fast, most real world problems aren't straightforward and obvious and therefore turn into something more complex. And now you've got a big can of worms because it was quick in the unspecial case. But now you have no real easy way to get to your special case working correctly without learning more and spending more time just like any other language or switching to a lower level.