From what I've seen, I don't have that same concern. He is positionally sound, seems to read the play well and makes smart plays with the puck. He does play fairly safe though and that could impact how much offense he has been able to generate.
From what you have stated I would think that a potential explanation is that Boucher is adjusting to the new league and new role and that maybe it is a lack of confidence that is impacting what he is showcasing offensively. He had this interview on TSN1200 a couple days ago:
Boucher: Grateful to be back playing hockey, starting to feel like myself out there again
He mentioned that the NCAA is more of a chip and run style of game whereas in the OHL he feels it is a more skilled game where there are more players trying to make plays. Relating to what I have stated earlier, I think Boucher was struggling to figure out his role in the NCAA. Maybe the coaches weren't doing a good job with that but the result was that he was moving around to different lines and not really finding much stability. I think it makes sense that this would lead him to play a much simpler and safer game and that his confidence would be a bit lower. Clearly the situation in the NCAA wasn't working and that is why he left to the OHL.
I do think he looks more comfortable in the OHL and he has showcased more of his offensive skills. The shoulder injury didn't help as it took him out of practices and games where he could become more comfortable and adjust his game. I think it part what you might be referring to is how long Boucher holds onto the puck (or more specifically, how little). In the OHL he has been making a lot of smart and simple plays but it would be nice to see him carry the puck more and look to use his possession to really set something up.
I think the 67's could really benefit from that as they don't have many players that can really generate sustained possession and in particular I find their D are pretty weak at that as I notice lots of instances where they fail to hold the line or shoot a puck into the oppositions' shinpads leading to a turnover. Actually, another thing I really don't like about the 67's d is that they really do a poor job of capitalizing on Boucher's speed. I have noticed a number of times where Boucher is flying out of the defensive zone and there is a clear outlet pass available and that the D panic with even a bit of pressure and curl back along the boards. Boucher may actually need to become less reliant on the d and actually carry the puck out from deeper in the d zone.
I think we would all like to see Boucher expand his role with the 67's and really start driving possession. With a bit of refinement he will be able to carry the puck fairly easily. His strength, speed and agility should make it easy for him to shield the puck and create skating lanes for himself. He has actually tossed people to the ground that have tried to hit him so he won't even need to worry that much about getting hit. He also makes really smart plays when he is being pressured so he does his job of keeping possession alive. But he could continue to do more of this and really help his teammates get set up by carrying the puck more and looking to make plays.
Part of the challenge will be balancing his passing vs shooting when prioritizing his development. He has a very powerful shot and a quick release and he has a bit of a tendency to play the shooter role by chipping the pucks to to teammates, limiting how long he carriers it and trying to get himself in a scoring position to get a quality shot off. From what I have seen, at both BU and the 67's he simply can't rely on enough of his teammates to get him the puck. He does his role, keeps the cycle going, gets himself into those scoring positions but then his teammates tend to lose possession, and then that forces Boucher to help regain possession and initiate the same process again. As I have stated above it does seem like Boucher might benefit from taking on more of a puck carrier role because he has some skills and attributes that are conducive to that. It would be different than the role he has been focusing on but it could be good for his development. Hopefully we see more of this as his confidence grows and he adapts his game to this league.