... What's so wrong about that?
It would, fundamentally, alter the rationale for any representation at all.
Peoples' views on issues, great and small, reflect much more than just political
ideology - because, I would argue, Canadians, in the main, are not especially ideological. Canadians vote because of how things happen to them, personally, in their homes, in their communities (that's why we have
"une chambre des communes", it is a House of Communities (not of commoners)) far more than they vote for (or against) some abstract ideology. That's why Jack Layton moved the NDP away from the ideological "left" and towards the centre: to make his party more attractive to more people by offering solutions that made sense to them in their
local communities; that's why he did so well in Québec - he offered himself and his party as being "in tune" with Québec's aspirations and sympathetic to Québec's point of view; that counted for a lot more than left wing
ideology which is more popular in Québec than elsewhere in Canada. Ditto for the Liberals' failures: Liberals post St Laurent/Pearson have been
ideological and they have steadily, inexorably declined from being the natural and
national governing party to being a regional, urban rump; in other words they forgot that "all politics is local."
There is a reason we have, for 10,000 years, banded together in communities and, more recently, in organizations of like minded people - political parties: we have local issues that matter to us and, to a great degree we want and need the support of other communities; it's not about
ideology, it's about communities and local concerns. Political representation needs to be local. PR is a solution looking for a problem - it is an unnecessary frill designed to make clueless people think that life is (somewhat) "fair."