I'm late but give my 5 cents anyways.
I'm actually doing "both" what's discussed here by the press on a MCE remote with the kind help of an IR-Receiver/Blaster.
So in the end I always have AC power cut (no standby power) but also have LE shut down properly before cutting the power. To turn my home theater ON or OFF is just one button on the remote and the IR-Receiver/Blaster orchestrates the rest (Turning the AC Plug On, send signals to Screen, Amp, LE Box to turn on or vice versa with proper delay for LE to shut down completely. I don't use/need any scripts in LE for this to work.