Stiemsma has run out of steam, forgive the pun, after a couple of good games.
I seriously doubt Steamer would solve what's wrong with this team, but let's be honest about things. Here are Stiemsma's minutes so far this season.
20
16
12
21 (starting and put up 13 pts, 7 rebs, 2 asts and 2 blks)
12
7
3
1
9
1
Again, not to say that Steamer playing more would necessarily fix anything with Boston, but to suggest he's not playing because he's not playing well is BS. The guy played one of the best games any Celtic big has this season and after one more game was essentially in scrub duty, even though our regular starting center doesn't play over 23 minutes a game and our only other backup 5 has been hurt most of the season.
And again, this isn't to say Stiemsma would the answer to any of Boston's problems, but the reason he's not playing is simply because Doc has decided not to play him and not due to some lack of performance. There are plenty of young players who are not doing any better then Steamer playing more minutes for teams who are as good or better than the Celtics.
Mike