Cross-posting to increase visibility:
Today I finally picked up the PDF for Path of War Expanded! I bee-lined to the aegis section because reasons (DM reasons and player reasons).
And already these customizations raise many questions:
1) because of Customization Points being a resource that can be changed, are the disciplines set in stone forever, or different every time you re-pick the customization?
2) Related to one, was this intended to allow you to have a small set of interchangeable class skills?
3) Why does Initiator's Soul specifically give Sleeping Goddess? Not complaining, just curious.
4) "Each additional time it is taken, the aegis learns one maneuver from his three disciplines." This reads kind of like you are gaining 1 from each of your three, rather than 1 from among your three. That isn't a question, just something I noticed.
Allow me to answer for you:
1) You can change the disciplines (except Sleeping Goddess) each time you re-pick the customizations. That is intentional.
2) Yes, it allows you to have a small set of interchangeable class skills. That's totally fine.
3) Sleeping Goddess was chosen because of its psionic themes, and some related fluff dealing with souls like the Aegis does.
4) I can see how you might get that reading now that you've pointed it out. To be clear, you only get one maneuver from among your three disciplines. Not one maneuver from each of your three disciplines.