I thought I understood how Archetypes work, since they're relatively simple in concept - if you take an archetype, you replace some class abilities with new ones, and this seems to hold up fine for Envoy, Mechanic, Operative, Soldier and Solarian, even the Technomancer.
However, I found a strange case in the Mystic replaced class feature at level 9. According to the list on p127, if an Archetype has a feature at 9th Level, then the Mystic either loses a feat or healing touch. A Mystic acquires Healing Touch at level 1 - how is this meant to work? Is it actually a typo, and meant to replace the Connection power you are supposed to gain at level 9?
Also, just how does the lost feat option work if you aren't single-classing as a Phrenic Mystic, and so actually take Phrenic Mystic level 9 as your 10th character level? Do you give up your NEXT feat? Do you have to give up a feat at some point before hitting level 9, in the hopes that you will eventually get there? Do you drop an already learned feat when you get that feature?
The Starfinder Forerunner archetype doesn't replace anything at level 9, so a Mystic Starfinder Forerunner doesn't raise this question.