No, PR does not favor centralist policies.  FPTP favors electing parties of the center as you can see from the exchange between 2 parties of the center for the last 150 years in the Canada and for even longer in the US and Britain.  PR favors diversity of opinion.  diversity in this case it not a good thing.  Small single-issue parties become common and you can find a party with an extreme view (left or right) having influence and holding the balance of power in a coalition.  Why would Canadians who favor "centrist policies" want that situation?  Stop messing with what works.  Only the politicians and media within the Ottawa reality-exclusion bubble care in any way about electoral reform.