The longer the feedback loop, the more annoying to use--even if the loop gives good results.

You get around the loop, excruciatingly, and go "no, no that's not it, here's new directions".

Even if the system does a good job!

Because maybe you steered it wrong, and you don't know until much later, and then have to go "ugh, is it worth it to wait for yet another loop through?"