You missed the key point - she's a FA. How many times have you seen them roll on with a roller, bag stacked on-top and a bag hanging from the hook? I don't begrudge them but the flight crew isn't/doesn't seem to be as bound by carry-on regs as us passengers.

(not a complaint, just an observation)

MODS - can you delete this post of mine - I just realized that this is a sticky and the comment is too trivial for a sticky topic - thanks