This is pretty big news.
Thank you for all that you've done and are still going to do in terms of gathering empirical data. If someone ever decides to make a WWI flightsim based on such data rather than on historical reports which sometimes have questionable figures (180km/h Pup, anyone?), it will be invaluable information.
For now, I have mixed feelings about this. On the one hand I'm sad but not surprised that we'll be stuck with this nerfed Fokker Dr.I. On the other hand I'm glad that the devs are sticking to their guns, all the while admitting that they simply don't possess the know-how to make the correct decision. There is no shame in humility, in that regard.
I'm not sure what the actual reasoning was not to go back to pre-1.034 on the Fokker Dr.I, but it does match the 165km/h top TAS in German Aircraft of the First World War. As to why it was so slow compared to tests performed today: we can always pull the Voltol card, or the fact that its speed now closely matches the 110hp Nieuport 17, which is also a tad slower than the 80hp Nieuport 11, but climbs far better.
For the record: the Bristol Fighter, whose climb and roll rate was reduced for 1.034, was also not rolled back, so the Dr.I is not entirely alone.
Or maybe that was an actual oversight, I guess we'll never know for sure. 😉
Beyond history, the gameplay impact is significant as well. We now have a Dr.I that no one can claim is "better" than the vanilla Fokker D.VII (which no one did back in 1918 either), even if it is the best turnfighter in FC. We now also have a pretty consistent picture where almost all Central planes perform worse than their Entente counterparts (the exceptions being the Sopwith Dolphin and Fokker D.VIIF), but have access to parachutes. This creates a good basis for assymetric warfare missions and having the action take place over Central lines. Combined with the fact that we don't have a Central recon two-seater such as the DFW or heavy bomber such as the Gotha, this is not such a bad thing for the immediate future.
P.S. I still expect the devs to come through with updated speed measurements for all planes released before the Albatros D.Va and S.E.5a, which were impacted by the prop speed fix.