This brings up a fair (IMO) question: in today's NHL, should you just run a goalie out for every start of the playoffs?
I've thought for a while there are advantages to running a tandem in the postseason, especially if you have two goalies with styles that are different enough to keep the opposition off-balance. But, I'd also held on to "... but absent that, if you've got a #1 goalie, you've gotta ride him until he breaks." I think I'm willing to change that view. If one is of the mindset that "I don't want to run a guy out for 60 games in the regular season, that will start to wear on him both physically and mentally" it seems a bit inconsistent to follow that with "... but I'm OK running him out there for 2 months straight, potentially playing 22-27 playoff games where the stakes are higher and he never gets a break unless it's an utter blowout or I'm forced to pull him."
I'm not saying give your backup some nearly 50/50 split, I'm not even saying split it 65/35 or 75/25, but I think if you don't trust your backup in the playoffs, you probably weren't trusting him a lot in the regular season and you have a different problem. Unless you're in a do-or-die situation where you look at your #1 and say "you're the guy I trust to come through" you find spots to get the backup in, trust he can do the job for a night, and spell your main guy so he's more ready when you really need him.
I think that for teams with a clearly defined #1, every playoff game is simply too important to not play the starter every night unless/until things go sideways. Which is why making sure they are as rested as possible entering game 1 is so important.
I think that a true starting goalie can give you 2 months of starting every game in the playoffs, especially if you can win one round fairly quickly and get them a 3-5 day break at some point in the first 3 rounds. The schedule in the Final is always super spread out, so it is realistically 3 rounds of consistent game-day off-game-day off with the occasional extra day off thrown in there. That is a grind for sure, but it is a for a short enough timeline that a genuinely starting-caliber guy should be able to manage if they aren't starting the grind already behind the fatigue 8 ball.
All that said, I do think that teams are (correctly) going to the backup (or 1B) quicker than they used to in the past and I think that this is a good strategy. I think the stigma around sitting the starter for a couple games and/or running the hot hand is less severe than it used to be. The Hawks don't win in 2015 without putting in Darling to let Crawford get his head straight.
Adin Hill only got 11 of the 16 wins for Vegas last year.
Kuemper only got 10 of the 16 wins for Colorado in 2022.
Fleury and Murray split the wins 9-7 for the Pens in 2017.
Injuries were the root cause of those last 3 examples, but there is growing proof of concept to the notion that you can win with a hot hand and don't need to trot out 1 guy at all costs. But I'm not at the point where I think that teams with a defined #1 should be giving their guy games off just for workload purposes. I think the much better strategy is to properly manage workload in the regular season to ensure that your guy enters game 1 of the playoffs with his battery as close to 100% as possible.
Lets say we make the playoffs next year and the goalies play at about the levels they each did this yea., I'm not going to Hofer while Binner is playing well just to keep Binner fresh. Instead, I'm making sure that Hofer starts 30-35 games in the regular season so that Binner is fresh for game 1 of the playoffs. I'd be ready to go to Hofer if Binner loses himself in the middle of a series, but I'm not keeping that split up in the playoffs when every game is huge.
A team that has 2 quality goalies running as a true tandem all year? I'm in favor of keeping the tandem going in the playoffs. I'd have gotten Ullmark into a 2nd game by now if I were coaching the Bruins.