Let me explain, if you are applying from India or from a country where VACs are still closed, then your application will be assessed through two stage process, irrespective of the complete or incomplete status of the application. The reason for that is VACs are not only responsible for bio-metrics collection and paper applications submission, but also they accept and handle the passports which are up for stamping and return them (including the ones submitted with paper application) to their owner. IRCC don't have a mechanism of their own to do so the above mentioned processes as they outsourced it to VFS like many other nations.
Now you might be wondering what is the significance of having a complete application if it will be treated the same way as others. Here are some benefits(for Indian applicants):-
1. If you are applying through SDS stream, then your application is processed under this stream only if you submitted a complete application otherwise it will be considered a general stream application even if you meet the former's eligibility criteria.
2. Once the VACs reopen, while the others will still require to complete bio-metrics which will take longer time as there is a limit to the appointments that can be done for a day, to get the passport submission request. Whereas the complete ones will get that request without any waiting, and as per my knowledge no appointment requirement for passport submission is required. So, you will get your visa stamped earlier.