The story was simple and rather sweet, but rather thin.
Sibling Dex, the monk, just didn't seem all that wise. They must have learned something in monk school and in having conversations with people who came to their tea wagon, right? But instead they seemed  unwilling to learn anything deep. Maybe that's the point? If so, it's just boring! Also the robot ingenue Mosscap is sweet but cliché. 
I did appreciate a glimpse (just a glimpse) into an eco-friendly, post-scarcity society, though; the notion that one can just decide to be a "tea monk" and that's a generally recognized job! The story takes place on a moon called Panga, which used to be industrialized until the robots decided to permanently go on strike. That was the Transition; the humans then did a "Half Earth Socialism" thing where they rewilded half the land and almost all the ocean. There's a lot of great potential to this world--imagine the social revolution that would have had to happen to make all this possible--so why is Dex so stubbornly individualistic in their approach to everything?