Let me simplifiy this a bit. If you are going to make a change to an object on the docment page, you need a REALLY good reason for it to be on the Parent page, and maintaining positin is not, in my opinion, good enough in a long document.
I never use Primary Text Frames (I've been using InDesing since long before they were added and never needed them). Text frame size and position are controled with the margins, and I use the Shift Key when placing text to autoflow and add pages as necessary.
You can define any set of parameters you like for a text frame object style and set it as your default. You can even define multiple text frame object styles and switch between them as needed. In fact you don't even need to define the object style if you define your paragraph styles and select them as required before placing the text, but again, in a long doc, object styles can be a big help.
... View more