That reflects some of the comments made by the chair.
The report was specifically on methamphetamine. I don't think anybody on this committee would be particularly thrilled if, on a charge of having all the precursors to produce methamphetamine, the person was able to get off by saying no, it was another schedule 1 drug I was going to make—phenyl-something-or-other. I'm not a chemist, and I don't know what's put together or how.
If the committee is so inclined, you can catch methamphetamine but also catch other schedule 1 drugs by transforming the offence into one whereby it is “possession of materials for the production of a schedule 1 drug”. It would accomplish that and it would be available, should there be other schedule 1 drugs that they start putting together in labs, etc. It is for the committee to decide whether it considers that appropriate.