> Meanwhile, iRobot still hadn’t figured out how to make an effective stand-alone mop bot, much less an auto fill station or combined bot that actually works

But then maybe that's where the synergy is. Amazon is probably ahead of everyone on the planet with machine vision. They have the Amazon Go shops, and nobody else has anything that comes close. If they take iRobot's robotics knowledge and couple it with their own machine learning expertise, who will be able to compete with them?