The reason people are asked to provide PCC during their process is because PCC certificate expires one year after the issued date. Although if you never travelled back to your home country, "technically" you don't need a new PCC but protocols requires that it should not be expired during the time they are doing your criminality check.
In IRCC website, it's clearly mentioned that you do not need to provide Canadian PCC for the duration of your stay in Canada:
"You
don’t need to give us police certificates for any period of time before you were 18 years old or for time spent in Canada."
Link
This is because Canadian criminal record check is necessary only if you answered "yes" to some specific questions in imm5669 (Q#6) form which means that you declared a criminal record on your application. If so, you will be asked to provide a "criminal record check" which is RCMP PCC.
I did the same and some other people who asked an ADR for this, however, it is up to you to decided whether you would like to include both certificates in your application.