Well said 411A!
The reason is mostly the deck angle. Until acceleration past 250 thru 10,000 or whatever it happens to be for the airspace, the deck angle is simply too high for walking around in heels, opening galley compartment and cart doors, or rolling those heavy carts around the cabin especially for our CC girls who are pretty much all... not big girls! So unless you have tried to do what they do in heels, it's easy to understand why the confusion. It's really up to them to decide when it's safe and comfortable to get up as far as deck angle or turbulence level since it affects them, not us. All we're doing is letting them know WE think it's safe to move around from where we're sitting, pretty and strapped in. Try taking a piss before 10,000 feet next time seeing how akward it is and then imagine yourself trying to serve drinks and push carts at half the size you are. If you think you should be able to tell others how to do their job when you are not qualified to do it yourself nor have you any experience doing it, you've got some micro-management sickness issues. Just relax.
cheers