This is patently false.
2011 bench during playoffs
Nenad Krstic
Glen Davis
Jeff Green
Delonte West
Carlos Arroyo
Sasha Pavlovic
Troy Murphy
Von Wafer
Shaquille O'Neal
Avery Bradley
There was one...only one...young player on the roster to be developed last year and whenever he got some time on the floor he was GOD awful. We did not lose due to lack of depth last year we lost because our best player who was expected to make a huge difference against a team with a horrid group of PGs got injured.
2010 bench during the playoffs
Rasheed Wallace
Glen Davis
Tony Allen
Nate Robinson
Marquis Daniels
Sheldon Williams
Michael Finley
Brian Scalabrine
The only young players we had that year were garbage and we traded away for Nate Robinson. Neither Lester Hudson nor JR Giddens are in the league anymore and Bill Walker hangs on by a thread in NY because the Knicks invested every penny they had into three players and have to keep minimum level scrubs on the bench. The Knicks currently have what might be the worst bench in the league.
So clearly there were no young players available to develop that year either and the only reason we lost was not due to a lack of depth, the team was deep, it was due to injury.
There was a lack of young players on the rosters at the end of both years in large part because we had traded them away for a pittance after failing to development them much.
Also, there was a clear philosophy in the organization throughout the last few years favoring acquiring more established (though injury prone and on the decline) veterans over trading for more picks, holding onto younger role players, or signing younger, less established players.
That philosophy affected the depth of the bench most obviously, but it also likely affected the latitude the team had in pursuing mid-season moves (since most of the bench players had little value except to other contenders). Now, this falls on Danny as well as Doc, but I can't help but think that part of that organizational philosophy was a result of the fact that Danny knew Doc wouldn't trust or play younger players.
You say we lost in 2010 because of Perk's injury and questionable officiating; I disagree. After all, they were leading by a good margin after 3 quarters without Perk. Rather, I think the team simply ran out of gas. The fact that there wasn't established big man depth to make up for Perkins' absence compounded that.
The mid-season moves during the Big 3 era have almost exclusively revolved around obtaining depth at PG or on the wing -- this despite the fact that Danny has used our draft picks during this time on mostly point guards and wings. I can't but help see that as a poor reflection on the team's ability to both identify young talent (whether in the draft, undrafted free agents, D-league, whatever) as well as developing that talent.
I think this off-season Danny finally recognized the need to prioritize younger, healthier, more athletic players over older, more experienced veterans -- and he said as much. As a result, this team has more depth in relatively young (under 30) players than they've had in a long time. Part of that has come as a result of necessity (injuries, condensed schedule). I wish, however, that both Danny and Doc had recognized the need for this shift sooner.