One things for sure, there are a lot of arm chair quarterbacks on the Internet, so don't get too worried....
I grew up as the son of a builder, working in the family business, then built modular buildings, built one home in 2001, and recently had a custom home built by one of the top builders in the area. Everybody has different framing/sheathing/assembly styles. We used to balloon frame in my dad's business, framing walls on the floor, then sheathing them and routing out all openings before standing up. Some guys just do framing on the floor and sheath after the wall is up. Some guys frame vertical and sheath vertical. You'll get arguments and pros/cons for all approaches. I think the bottom line is that the framer and builder need to be good and confident in what they're doing so that they can stand behind their work.