They were atrocious defensively and needed to trap to survive because of it. They went through new 1A goaltenders or ran a rotation for years.
Front end talent is only as good as the back end that keeps the other side from neutralizing that talent. You clearly disagree because your entire hockey philosophy is based on one single notion: offense is the best defense. But if anything those failed Caps teams should show you why that's not true. They couldn't stop anyone and peppered MTL but would then give up goals the other way.
Shift to the period you lament...
Let's look at the playoff GA stats from 2010 to 2014:
View attachment 452005
These were the stingiest teams in the league over that period. What do you notice? Hawks (twice), Bruins, and Kings were right there, and all the Cup winners came from that list. Who else was there? The Capitals.
Now look at the GF just to the left. Less than 1 goal difference per game in the playoffs between us and the Cup winners.
So in a way I agree...we shouldn't have been scrapping plans wholesale so much as trying to find that one additional goal per game. That's usually found in the form of one or two guys playing above their contracts, or guys NOT going completely dry, rather than totally shaking up the system.