I've contributed to, and helped test WWI flight modeling as modded to CFS3, and can say there's a lot of hard work that can go into their creation, despite the limitations of the sim's FM engine.

I guess you can say it would be harder to get authentic-like results working with fewer tools than not, and WW2-era sims haven't needed to model appreciable amounts of adverse yaw, and gyroscopic precession, and big, slow turning props, and poor control ergonomics, and unstabilized rudders and elevators, not to mention problems like insufficient control surface size, and the fact that most of the WWI-era planes flew on thin, sharp-nosed airfoils that made the onset of departure quick and unforgiving.

Which sim series, or flight model series people enjoy to fly may be very subjective, but there should be no real disagreement that a WWI sim does need a flight modeling engine that gives the designers the tools to make "WWI FMs".

We've heard that GT is adapting the IL-2 engine for the WWI-era, and this is where the rubber will meet the road so to speak.....I wish them the best of luck on this, because getting the basics right (albeit more WWI-specific "basics"), will mean whether the tools exist or not within the sim's engine to start the job of flight modeling these early warbirds from the start of the process.

If the parameters, and layers of WWI flight modeling complexity is not pre-built into a sim's flight engine from the beginning, no one will have the ability to make good FMs or bad ones, they'll only be adaptations of some other era's aerodynamic "reality" anyway.