I agree with you and that is what is mentioned on IRCC website. But last year in 2015, there was a rejection case as the applicant had submitted Indian PCC which was around 4 to 5 months old at the time of submission. Reason was given that the PCC is too old to be considered valid during application processing. The applicant was correct on his part, but the VO in question had his own way. So, therefore to avoid such hassles, it is best recommended to get your PCC for current country of residence after you receive ITA.
In short, IRCC expects an applicant to make most out of the 60 days period after ITA to obtain medical report and current country's PCC.