> isn't interacting with customers frequently enough to upend their plans every 1-2 weeks.

As I said, re-planning is more often than not needed because of technical challenges developers are running into. If one person is going to take 4 weeks to deliver something instead of the expected 2 days, lots of things may have to be rejiggered.

But also, yes even "real product driven company with a mature products" are changing plans every 1-2 weeks. Because each new incremental feature is a little project of its own. I never said plans get "upended" but they absolutely need to get re-adjusted ever 1-2 weeks based on both dev input and product/user reaction.

If you want to talk about the iPhone, just look up the history of how the software keyboard was developed. Talk about rapid prototyping and upending plans!