I've play-tested at least a couple of hundred models of clarinet (after servicing).
I've played on many wooden clarinets that are definitely quite inferior to the average plastic one.
The potential tone/response/volume inherent in a clarinet has little to do with the material. After all, the sound is made by a vibrating
air column.
It is the precise
shape of that air column that makes quite a big difference - bore shape, undercutting of tone holes, tone hole diameter/placement/height, etc.
(However it may well be that the average plastic clarinet is designed more for a beginner to play easily, rather than fulfilling different demands of professional-standard player.)
Note that the top-end "Greenline" clarinet made by Buffet is effectively a plastic clarinet. It really has none of the structural properties of timber.
Don't believe all you read or are told!