To deal with international students with skilled work experience in Canada, IRCC can do CEC-specific draws and can bring the cutoff to as low as it might need, without having to change the existing Express Entry (CRS point allocation) system, as Canadian education and experience already allocate additional points to the candidates as per the current EE system.
International students without any skilled work experience in Canada are comparatively disadvantaged simply because they lack the necessary expertise and the practical skills Canadian economy needs. So, if on completion of their studies in Canada, if they are unable to secure a job and get the necessary practical experience and/or training and develop their working skills, they don't necessarily need to be given any extra advantage to get Canadian permanent residence, as their basic intent while coming to Canada was education and they paid for their education (not the PR).
International students are required to leave the country after completing their studies (check the UK rules, e.g.). However, if Canada allows such students work permits for limited time period after completing their studies, if they can get the required skilled work experience in that time, they should be able to get enough points and get selected through the existing system (and/or the CEC program). In fact, they would get more points for their Canadian education and experience and would already be at advantage as compared to the foreign candidates applying for PR without any additional points for Canadian education and experience.
Actually, I think, so far, IRCC has been admitting the majority of the applicants as PRs through the Express Entry system who are already in Canada. The high cutoffs clearly represent this. There are not many foreign applicants who can achieve that high score without having any Canadian education and experience unless they have exceptionally good language skills and have at least the Masters, and are not very old.