I agree 100%. If you want to deliver valuable software you need short iterations because you need to validate assumptions. Anything you build more than the bare

I agree 100%. If you want to deliver valuable software you need short iterations because you need to validate assumptions. Anything you build more than the bare minimum is not included this feedback loop so your assumptions are not getting validated and you don't know if you're building the right stuff. This is not easy though. You don't want to paint yourself into a corner because of earlier design decisions that turned out to be unexpectedly very costly. So you need to have some set of assumptions that you will not get a chance to validate soon. I guess experience helps here.