Unlike many places overseas we don't have paper strips any more so have to manually create an electronic flight data record if we don't have access to a filed flight plan. While it's not difficult it takes more time than grabbing a strip and quickly scribbling some brief details on it - there are quite a few compulsory fields to fill before the system will accept it.
If you happen to strike us when we're busy with something else more important you'll likely get told to remain OCTA until we can spare a minute to create the plan. If you do file one we won't get a copy unless you plan to enter CTA in the first place.
Stop being a plonka with the "more advanced" crap - different systems have different requirements. Get over it. It's very easy to be flexible with a "dirt track" 1930s pen and paper system as you can write what you want where you want. Not so easy with an electronic one that requires things done just so.