Absolutely not. He has contributed nothing in the playoffs and belongs where he is, on the bench.
What I have seen of Stiemsma in the playoffs has been bad and I agree with Coach. He had a good game 1 vs Atlanta and since then has look terribly slow on rotations, unable to handle the athletic big men the Celtics have faced in a one on one defensive situation(Smith, Horford, and Lavoy Allen have made him look bad), and even his offense looks scared and slow. He's had tons of open 15 footers and doesn't take them and his picks are slow coming and late.
And this perplexes me because the last month of the season Stiemsma looked like a solid back up center. Now he looks to be where he should be, sitting on the bench.
Also, can we please stop with the calls for Sasha, Daniels and Moore as well. The players playing are the right players. Live and die by them. They may not play great every game because of injuries but they will get the job done.