If you want to look at basic PP% instead the Leafs were middle of the pack except for a torrid stretch in December. From Jan 1, 2020 through the stoppage in play they were
14th in the league in PP% which doesn't scream "don't change me."which doesn't scream "don't change me." There are reams of caveats to go with that, of course...small sample size, mixing data from both units, etc, etc, etc. Going 15.4% in the play-in round isn't a ringing endorsement for status quo either, although again that comes with a boat-load of caveats.