Oh I see Laser.
Well, it would be an exercise in futility to try to investigate the various stall/spin characteristics of these aircraft in a forum thread like this, and then how they might be modeled in Rise Of Flight yet. I think Uriah and BigBouncer were making general statements about hoping for good stall/spin dynamics for the sim's aircraft, so that these maneuvers are available for players to use in-game if they choose.
They are correct that spins were intentionally used as defensive maneuvers in combat (1917-18), and that the means of entry and recovery was being instructed in the training centers of the time also, as well as in the field by customary squadron-level "checking out" too (this is much easier to document, as I hope I did). As contained in that first excerpt on training changes above (perhaps this went unread):
"In fact, one could argue that the changes made to the theoretical and, even more importantly,
practical nature of instruction was considerably more influential."
I read comments sometimes about WWI aerial combat that tend to dismiss the subject as if it was all an unsophisticated exercise, but these men treated the matter with all the respect and ingenuity that they could muster for something as important to them as any life or death struggle. Tactics, and operations were fully fleshed out, and the science of aeronautical study using wind tunnels, and statistical analysis was well under way. Of course there was much yet to be discovered (learned), especially about dynamic forces expressed in flight, but basic fundamentals were being well understood by the war's end. In fact, in the area of fighting tactics, much was lost in the intervening years between the World Wars, only to be "rediscovered" in the second, and might I add, much of it to be propagandized as new innovative thinking, which instead had all be invented before in the Great War.