* Two different Prestos, prestodb and prestosql for maximum confusion. (I think one renamed)
* Making Controller highly available by default is hard
* Autoscaling workers is not simple
* Code very dependent on its own webframework that tries to do everything and lacks docs.
* Resource planner for multiple queries is lacking
* Worker configuration takes a lot of skill
All of these could be solved, but in most cases you can find other solutions where you get a simpler set of problems.
