tph216,
Inventor sketches do not care about default datums, the origin, or geometry projected from other features. Any references made to them (in a sketch) will be abandoned should you try to move that sketch to another surface (even a parallel surface).
What Inventor does care about, is a...
Clearly...(clearly!)...your comments are dictated by what looks best in terms of sales/PR. Telling the world that all of my various gripes with Inventor are due to lack of training is inane - especially when you don't even know what my gripes are.
(...you hate spreadsheets but love programming...
You write: "I also don t mean to complain but I am familiar with both pro e and SW and inventor just doesn t seem as cooperative, or is it just me?"
====
It's not just you, that's my impression as well - I started with Pro/E, then worked at a place with SW, now I find myself working with...