I think you have a legitimate concern there.
Oftentimes, you see the back-and-forth between PSPC and the department where PSPC is running the procurement process and the department is providing the technical specifications. In some cases that I've been involved in, you can see where there is discourse and disagreement between PSPC and government departments on whether or not those technical specifications are appropriate, whether they're appropriate in the procurement context, whether they are too specific, and whether they effectively eliminate all but one bidder and effectively sole-source. You can see these discussions going on in some cases.
I think you've raised a valid concern.