I think the best way to sum up my concerns with goaltending is that you're going to run into a point where you're going to need your goalie to actually help you win a series, unless you get really lucky with matchups. There's going to be a point where you need your goalie to out-duel a better goalie, with a matchup against someone like Price, Holtby, Lundqvist, Vasilevskiy or whoever else. If your goalie is just there and not helping you win, you're not going to win that matchup.
The Penguins goaltending has been consistently blah since 2017. It's putting up okay-ish stats while giving up some super deflating goals. Even if you solve the other problems with the team, I don't think you can win with that unless you get super lucky with matchups. This team doesn't need their goalies to be great, they just need them to be better than what they have been for the last 3+ playoffs.
Saying "goalies are crapshoots" isn't a defense of continuing down the path they've been going for years.