Getting AOR simply does not solve anything. I have AOR for 815 days.
When people gets their AOR, they start to wait Pre-arrival letter, then they wait for medicals, DM, COPR, and so on.
Even people wait 4 months for PR card.
People think that everything will be over when they move forward to the next step but it is simply just another waiting period.
Besides, IRCC has already announced that even there is a problem in the initial application file, they will not revert those applications back.
IRCC will only ask for new/updated documents. This may increase processing time of your file but your application won't get cancelled.
If you are worried about increase in processing time of your file because of missing/wrong documents, you would have checked your application deck 10 times before sending it - esp. for an important file that effects all your future life.