I'd argue that this is poor guidance. Certainly one shouldn't pref bid in this environment of forced upgrades. However, contractually, profer to displace is run right after pref bids and before straight displacements. Then, when training is assigned, profers get first crack at slots (in seniority order) before pure displacements (reverse seniority order). In my mind, if one truly wants a certain airframe or base, but doesn't want to chance a seat lock, it behooves one to use the profer to displace tool. Then, if you're happy with what you got, volunteer for the seat lock and profit.