I think the team might need to try a tandem in the playoffs. They can select a guy before the playoffs begin and try rolling with him, but I think it's highly unlikely either one of these guys carries the load all the way through. One of the Blues' problems is that they wait too long to make any adjustments to their lineup. Hitchcock insists on rolling the same guys when it's evident that the tables are starting to turn towards the other team. I feel that in both 2014 and 2015, we kept Miller and Allen in there too long. They weren't playing terribly, but they weren't really getting the job done. Elliott didn't even get a chance against the 'Hawks, and I think he should have started game 6 against the Wild. When Allen let in the 2nd goal, it was far too late then. The game was lost. That Blues team had virtually no chance of scoring 3 goals.
That's my take. I just don't really agree that you HAVE to start the same guy every game as long as he's healthy. It's gotten us nowhere. Plenty of teams have used different goalies and gotten to at least the conference finals. That year Halak got praised in 2010 gets overlooked, but the Habs used both him and Price quite a bit. And they made it a lot farther than we have.
I know the playoffs are different from the regular season, but I think in a way we need to start treating them the same and stop overthinking. We compete for the President's Trophy by using a tandem and then suddenly when the playoffs start, we have to immediately abolish that exact strategy that we win with? I think it's a bit extreme, and it hasn't worked out for us.