flytheplanemay - I think you may be missing my main point - that is, it's against the law. It is not merely a bad idea - it is not permitted, under the Civil Aviation Orders, to be moving in the cabin when the presence of turbulence has been defined.
CAO 20.16.3 para 3.1:
"Each crew member and each passenger shall occupy a seat of an
approved type:
(a) during take-off and landing; and
(b) during an instrument approach; and
(c) when the aircraft is flying at a height less than 1000 feet above
the terrain; and
(d) in turbulent conditions:
except:
(i) infants, children and stretcher cases carried in accordance with
subsections 13 and 14 respectively; and
(ii) package dispatchers carried in accordance with section 29.5; and
(iii) parachutists carried in accordance with subsection 16."
Paragraph 4.1:
"Except as provided in subsections 14 and 16 safety harnesses, or
seat belts where safety harnesses are not fitted, shall be worn by all
persons at the times listed in paragraph 3.1. Seat belts and safety
harnesses shall be adjusted to fit the wearer without slack."
Subsections 14 and 16 referred to above relate to stretcher cases and parachutists - not applicable.
The only grey area would be mild turbulence - but DJ's policy is to remain unsecured until it's hard to stand up. DJ management's view on the matter is quite frankly irrelevant - company SOPs cannot override the CAOs. The flight attendants do not have a legal option to remain standing in the cabin - which is why the airline has liability issues when something serious happens.
In short, being seated/secured is good safety practice, but more importantly, the ONLY practice allowed under the Civil Aviation Orders.