Well i have no doubt tha China will catch up, since it has all it takes to build a reliable proven turbofan engine. But it will take quite alot of time. However every country has to start from somewhere.
For example British engines were also widely licensed in the US after WWII. As i said earlier, our most famous design, the Nene would also power the USSR's/soviet union jet aircraft after a technology exchange. The soviet later copied it and started exporting them without our consent, and when we demanded compensation for patent infridgement they gave us the middle finger, soviet bastards. Lol
Moreover, American designs would not come fully into their own until the 1960s, before that they were also relying on our designs. So i dont think we should make fun of China , japan or any other country who is struggling to build a reliabke turbofan engine, its not an easy task, its the technologically most challeneging tech/expertise to master and requires alot of time,money, capital, skilled engineers and experience.
As for Germany, are you kidding me bro? All western countries and soviets(bar maybe britain) all learned from the beginning engine tech from the Germans. The allies all studied german engine tech after the nazis surrendered. The He 178 was the world's first jet plane built by germany. So Following the end of the war German jet aircraft and jet engines were extensively studied by the victorious allies and contributed to work on early Soviet and US jet fighters. An examole of this can be seen from the legacy of the axial-flow engine as practically all jet engines on fixed-wing aircraft have had some inspiration from german design.
Moreover, the V2500 turbofan engine is jointly produced by the U.S.A., U.K.and Germany . It powers airbis planes, with over 5000 orders to date. German company MTU also makes grat engines like the PW1100G-JM Turbo Fan Engine whic powers Airbus A20s. In fact many german engines are license built in china and helps powrrs many chinese military equipements from naval warships to tanks etc. Germany is among the tier 1 engines makers worldwide.You shoud also check out The Messerschmitt Me 262 of Germany,it was the world's first operational jet-powered fighter aircraft, and was faster than any allied fighters, even faster than our gloser meteor(which happened to be britains first fighter jet, and the Allies' only operational jet aircraft during the Second World War.)
If there is any country i respect the most in Europe and even the world is the bundenstag, they are second to none in all fields and everything they set their sights on doing. Not even the U.S can match them in some fields. 'Deutschland uber alles,'