IRR you took the words right off my keyboard
We do the same as you. Demo as doors closed and slides armed. Just in case the SLF has to vacate via these whilst we are waiting to push back.
Personally I feel we should use more direct language to draw pax attention to the contents of the safety brief and it's purpose. We have a Captain who when he does his intro says " Please play close attention to the safety instructions given by the CC. It is given for your benefit not theirs and could save your life one day, hopefiully not today".
May not be strictly standard but it sure gets the pax attention!!