Yeah, the critical thing is to try to appeal to as many ordinary people as possible and to avoid breaking the electorate into defined boxes each held to be somehow mutually incompatible with the others: if you do that you'll never win. You don't have to choose between Windsor and Waterloo or between Toronto and Thunder Bay: in fact the differences between all of these places will be functionally a lot less than they were thirty or even twenty years ago. Similar lifestyles, similar problems, even, these days, quite similar places of work on average, and where there are significant differences they generally aren't the sort that obviously contradict and oppose each other.
And even if it didn't have those negative consequences, targeting only one or two categories of seats would just be a confession that they don't expect to win (in which case you can kiss goodbye to the promiscuous progressive vote.) To gain a majority they need to gain seats in Toronto, in the 905, in the north and in small cities. Give up on any of those and you're giving up on winning.
