The chunking behaviour is transparent unless you have a side-effect in your sequence function, which isn't sensible anyway. The chunked behaviour performs significantly better for the majority of cases which is why it's on by default, I believe.
Rich (creator of Clojure) addressed concerns similar to yours in this reddit discussion:
Is there any way to de-chunkify sequences in an exponential way ("uncover" twice as many elements each time instead of a constant number)? Would this be useful?
