Imagining that a privy council would have made a decision that you like better, because they rely on voter goodwill,
Not just because they rely on voter goodwill, but because they can bring an element of practicality into their decisions the SC ignores. For example, the Sing decision, which granted full Charter rights to all refugees, has turned our refugee determination process into an agonizingly slow, drawn out, and hideously expensive farce where phony refugees go through years of expensive appeals (all of which we pay for) before we can boot them out. A privy council law council might just overrule that, saying it was impractical and not in Canada's interest. They likewise might have overruled the courts on the subject of native oral histories, dismissing them as completely unreliable (which they are, of course) and not be used as evidence.
Why would you expect that those same voters would force a privy council to make decisions that you like more times than not?
As unreliable as the largely indifferent public is, especially given the third-rate nature of Canada's media, democracy is the only brake we have on governmental stupidity, criminality and arrogance. And the SC, as constituted, has NO brake or restraints whatsoever. They can quite literally make any sort of decision they want on the basis of whyever they want to make it, and cannot be challenged.