I have the opposite view on this.
Last year in regular season caps were on cruise control and we made hardly any adjustments.
In playoffs after the first couple games - it was obvious Pitts gameplan was the one controlling the series. Caps didn't ever adjust or do anything different. It was the mentality "this got us here so we will stick with it".
So now that the pairing you mentioned is killing it - and arguably best in NHL - I think we try other things too.
Nothing wrong with trying different things. The more lineup switch around they do and find some things that might work - the more options and successful different looks Caps can give opponents if needed later on.
The difference here is that 27-2 was a pairing earlier in the year and for 2+ seasons now. It's nothing new, even if they haven't been together for about a month or so now. They'll likely get the job done defensively but at the cost of any sort of offense. In addition, the team isn't on cruise control right now like they were last season. They have their foot on the gas looking to demolish the competition and have been successful. This is completely different than last season where they were on the defensive for much of the season, despite winning. Trying something new would be 27-88 as the second pairing, and if anybody has earned more ice time right now it is Nate Schmidt. He has been excellent all season but especially recently.
Agree, switching D pairs is fine, and even wise.
What is not fine, is ignoring a solid sample size of positive data, and never going back to it. Or, only going back to it at the 11th hour out of desperation.
This is a solid test for Twabby's theory that the new D pairs has a big hand in our recent demolishing, dismantling, decimating, and destruction of opponents.
The bolded is what worries me. Supposing Carlson is out for a few games, will Trotz go back to the current D configuration once he comes back? I sure hope so, but I'm not convinced given his reluctance to change things. These pairings have been to my eye and certainly statistically the best that this team has had in ages, and it would be a catastrophic mistake to not return to them (unless of course an even better configuration is created).
I'm convinced that there was a major tactical shift last month, but I think it was also heavily intertwined with the new defensive pairings being able to execute it. I don't believe that 27-2 and 44-9 will be able to execute at as high of a level. Orlov, despite being a right D for much of his youth, is much better at left D IMO. He's had trouble at RD in his own zone so I don't really understand why he's going to return to RD tonight, especially alongside Orpik. They were not very good together last season.
We'll see, maybe I'm completely wrong.