There is nothing to take away from what you witnessed in the preseason so far other than the Panthers are focused on practicing a more traditional run game during these sessions.
I know the Panthers want to make power running more of a staple & base of the offense instead of the read-option (per Shula himself), but that doesn't necessarily equate to conservative.
The Panthers have been one of the least conservative teams on offense the last couple of years. While I think Shula (given his background & statements) wants to be more conservative than Chud, I hope and think he will still retain some of the higher-risk plays given the weapons we have in Smitty, Ginn, Jr. & Cam himself.
The Panthers have been near the very top of the league the last 2 years in explosive (20 yards+) plays. There is no reason to completely abandon that. At the same time, the Panthers have come out, especially in the 2nd Halves, throwing caution to the wind & having a lot of 3-and-outs where a more conservative approach would have been better IMO.
I have been to training camp many times, and everything open to the public is open to the rest of the NFL. It does give you a good idea of the overall talent level of individuals and groups (and who has the potential to contribute, etc., but very little can be gathered about the scheme. That is by design.