The whole point is one needs to inform IRCC in case of any circumstances change (Marriage) after you have been issued a COPR. In my case, I was single when I was issued a COPR. However I got married after COPR but before landing. In which case, I am required to raise a webform to communicate IRCC regarding the changes and wait for their instructions.
This is not optional, it s mandatory to communicate these changes and yes the expectation is that IRCC will examine my spouse and add him as my dependent and further reissue new COPR's for both of us. This is basically to ensure that your spouse is admissible to Canada, which has a direct impact on the principal applicant's admissibility also.
If I try and land on my existing COPR, then the status on my COPR (Single) is not matching my actual status, which could be interpreted as misrepresentaion in the event that my spouse has not been declared already.