OK, this is helpful to know that underseat storage is off limits for the exit rows - but if this is a safety issue, why was she permitted to stow her crew bag there? I've never sat in 15G before, always 15B, and never had a problem. Anyway, it's not a big deal - keeping my rollaboard in the closet was not really any problem at all.
This F/A didn't ruin my flight - the fact I worked a full day today and am on FlyerTalk at 10:28pm Sydney time shows that it was a pretty restful night on 863.
BTW, this F/A did not look too old - she probably was a reserve who has an attitude problem. I am staying at the unnamed UA crew hotel in Sydney so hopefully I don't run into her again.... :-)