There are only a handful of programs in Canada that are in the same league of competitiveness for admission as the highly selective US universities. With the exception of UBC, holistic admissions is a “by major” requirement and the only reason they exist is because the high level of demand for those very specific majors at those very specific universities makes it difficult to differentiate among the top applicants. Even then the very first passthrough is grades and it tends to be a very high cut off.
Waterloo Engineering and CS are interesting and while they do practice a holistic admissions process somewhat akin to those used by top selective US privates, the net result is very very different. While the purpose is to eliminate the supposed “bots” i.e. one dimensional students, it’s certainly not to craft a class for the purposes of enhancing campus culture. Waterloo’s mandatory co-op program in those majors actually precludes students from getting overly involved on campus which is kind of ironic since the holistic criteria they use actively encourages the same level of “applicant crafting” and EC arms race that many decry of the US system. It also produces a very unique culture that is a turn off to many students who would otherwise apply to the school for different non-impacted majors. S#1 did apply and despite the fact that a number of his friends did choose it (including his girlfriend of the time) ultimately decided that the campus culture was not for him.