Not entirely. I think Lamar has some issues in progression reads. Flacco was the same way. And if he's coming up to the line of scrimmage and sees what the defense is doing, is he changing the play or trying to fit a square into a round hole? I would say it's more of trying to force things that aren't there. I also think he was much more decisive last year when he didn't see an open receiver and took off. You want to see him develop as a passer but at what expense? His main talent is running with the football, not throwing it and I think it will always be that way until he's past his prime.
I think the answer is somewhere in the middle of what you/Biggsy are saying.
Lamar knows that he has the legs to take off, but his primary talent has been throwing the ball. It seems like he's taking longer because he knows his legs will get him out of it, which was working earlier on but seems to be less successful as we go along.
I don't think he's looking for highlights, and I don't think he's trying to force anything. I think he's still adjusting to game speed with varying amounts of success.