You failed to read some additional articles, as Singletary isn't the only opinion that matters. How bout that OC (see below)?
"The one thing I want to do is encourage his daring," he said. "I want to encourage the stuff he has inside and allow that to come out without stifling it." Still, Johnson noted there were some bad plays that Smith has made that, to this point, he has gotten away with. Johnson pointed to a play in the fourth quarter when Smith, under pressure, threw a pass that luckily hit the ground before it reached two Rams defenders."
Said Johnson: "That's what I think coach Singletary is referring to - making sure that when you are pushing the envelope so to speak and you're being aggressive, that you don't take away from the big focus, which is making sure we take care of the ball."
http://blogs.sacbee.com/49ers/archives/2010/11/it-takes-a-vill.html
The old problem with Alex is that he didn't even try, and when he did (thinking 100% open) he may still not make the right throw. Now Troy is taking chances and making the throws at the same time. He may make some mistakes in upcoming games, but so far the positives outweigh the negatives.