Been reading the Occult Adventures more intently, and some things about the kineticist just irk me. Not like the burn, as it can be mitigated in ways, and is ultimately there for balance. It's just that some of the features feel incomplete.
One that I've seen brought up a few times is that most of the four elements are included, those elements being fire, cold, and electricity, but there is no acid. Earth just lets you throw rocks at people, being one of the two schools that only offer a physical based simple blast, with the other school being telekinetic. Then again, fire is the only school with only an energy based simple blast. Not that I can think of any fire-based physical alternatives. Air and water both have one physical based and one energy based simple blast.
Another is that building your kineticist in the wrong way can potentially cripple you. If you were to choose electricity as your first simple blast, earth as your second, and cold as your third, you would never be able to do a composite blast, as there are no composite blasts that include electricity and earth, electricity and cold, or earth and cold. I would prefer it if you were able to access all of your chosen schools' simple blasts, either by default or as one of the kinetic talents that you get while leveling. If you can get the defensive abilities of other schools through a talent, I do not see why you can't get other blasts the same way.
Not exactly something that would completely ruin your characters, but this stuff does bug me.