Just answered and raised same concerns.

1. Looks - well...who cares ; D But, to be honest, I like the look, but here we talk functionality.

2. In my scenario it's pretty close to full pack/unpack. If you open it like a kedavr there is nothing I can't access and everything is visible.

3. You can retrofit fidlocks to make unbuckling easier. If so - then it's a matter "pull the flap and dig hand it". You know exactly where everything is, since there are only 3 zones of the backpack, that don't mix (pretty much like colours in a toothpaste)

4. You can unzip without opening the flap. If some items are not in the internal pockets - they are reachable from the bottom too.