I do not know what policy iRCC is following now specifically or in general. However, I strongly doubt it is by country.So what policy IRCC is following now or in general? easy files over complicated files regardless the received date. How also they can judge easy and complicated is it based on the applicant's country as it appears now. I totally agree and know that the overall processing time is on a case by case basis. But on that stage all applicants are equal it is only checking the completeness of the applications.
I don't follow in great detail the current tracker situation but warn that all should be skeptical that what appear to be - at certain times - overrepresentation of eg certain countries is more likely to be spurious.