I agree that an individual needs to be competent with his firearm prior to going afield, but one element that is difficult to train for is how to respond correctly to the stress of a dangerous bear encounter. To this end, I believe that taking the semi-auto off the table is short sighted, particularly if we are talking about the individual who has never killed a big game animal. In a high stress situation, such an individual is prone to short stroking a pump or other manually operated action, where the auto takes reliable cycling out of the equation.
At a time in our history where every major military engagement is carried out with automatic weapons, perpetuating the myth that an autoloader cannot match the reliability of the manually operated firearm fails to measure up. Beyond reliability the self loader has a number of side benefits.
One benefit of the gas gun as opposed to manually operated actions or recoil operated guns, is that recoil is mitigated by the cycling of the action. This reduction of recoil will encourage rather than inhibit the novice to practice with the same ammunition he'll carry in the field. Having said that, having a gun that fits is the first best step towards managing recoil. I might add though that should a recoil operated action, including the newish crop of inertia driven actions be chosen, without sufficient mass behind the gun, the action will not cycle.
But a bigger problem than the choice of action is that some people give more attention to an axe or a canoe paddle than they do the firearm they are relying on to save their lives in the field. This quaint habit of exposing the firearm to all manner of neglect and abuse is troubling. If the follower is rusted to the magazine tube, it doesn't matter what cycles the action. If the magazine tube is dented, it doesn't matter what cycles the action. If the action is allowed to accumulate with all manner of crud and debris, it matters not what cycles the action. A few minutes of daily attention at the end of each day will keep the protection firearm in serviceable condition.