Collecting arrows shot by skeletons!

Today we use the feather and flint (an ore obtained from gravel) to create four arrows, and when we eliminate a skeleton, sometimes a flint drops as well. If we shoot ours but miss the target, we can collect them again, but why can't we pick up the arrows that the skeletons miss? They get stuck in structures, and sometimes if we break the blocks, they fall and even do damage, so it would be fairer to be able to collect them too, since we know that the objects disappear after a certain time.