Yet if there’s one thing I’ve learned about Jeff Bezos, Amazon’s founder and chief executive, after years of watching Amazon, it’s that he doesn’t spend a lot of time predicting future possibilities. He is instead consumed with improving the present reality on the ground, especially as seen through a customer’s eyes. The other thing to know about Mr. Bezos is that he is a committed experimentalist. His main way of deciding what Amazon should do next is to try stuff out, see what works, and do more of that.