Foremost, the accused will be required to present expert evidence confirming that they were in a state of extreme intoxication. Then, it will be up to the prosecutor to determine that was not the case or that the accused departed from the standard outlined in section 33.1. This means they cannot use this defence.
Prosecutors already recognize these standards and are used to them, so it should therefore work pretty well. Judges are also used to them, especially since the Daviault ruling and the previous version of section 33.1. The specifics included in Bill C‑28 will facilitate their deliberations.