Lets be honest we're not talking strong goaltending here, nor strong defense,
Leafs have 1/2 their cap invested in 4 high scoring forwards and its those core 4 that outscore the Leafs goaltending for the most part. Leafs win rate is based on if Leaf goalies surrender 3-4 goals against on >.900 sv% then Leafs need to score 4 or more to record a Win.
That works fine for the regular season because Leafs being the 2nd highest scoring team masks the team weakness its goaltending, by outscoring it. If it doesn't happen in a game no big deal, move on the next game. Law of averages with a +64 goal differential it will happen more times then not, based on Leafs 315 GF in 82 games = 3.84 GF/g vs 20th team ranked 3.07 GA/g.
However when the playoffs start and checking gets tighter Leafs offensive production drops and when opposition hold Leafs core 4 in check then their goaltending fails them, their secondary offense limited by Cap mismanagement and its lost in round #1 over and over again. That is because there is no next game in a best of 7 series and when GF and GA differential flatten out once GF = GA, it all comes down to the goalies making key and timely saves to win and advance.
Same conclusion every year Core 4 is fine, goaltending and secondary scoring needs improving, but with limited cap space it always bargin bin shopping for cheap depth players of other teams castoffs, and goaltending which should be priority #1 becomes an afterthought, and that is why the Leafs are going with reclamation projects in net, with a contract dump with retention and an unqualified RFA cut loose, because that is all they can afford to spend on the position.