If you call the Avia C-199 (a plane wich was hated by its pilots and had 358mph topspeed), or the Buchon (a modified spanish 109 with worse general performance) 109 "developments", then I dont take your judgement as a good one. They were "adaptations" of existing cells with existing engines, for third rated air forces (or desperately short of planes ones, as the IAF).
I know that your message is a sad and pathetic troll, but Just FYI, I'll tell you why did the 109 saw some ...ahem..."Development"...after WWII.
Czechoslovakia had a couple of factories wich were building 109 airframes, but had no DB engine factories. They had, though a big stock of Jumo-211s, so they put the Ju211 in the 109G airframe. Why?. Because they had no other plane at hand to build and sell.
Spain had a licence for building 109Gs. After WWII and up to the late 50s, Spain was isolated because its fascist regime (franco). So Spain could not get new planes easily. All it was available was the national production of Hispano aero engines and 109 airframes. There was no DB produtcion in spain, so the Buchon was first built with Hispano-suiza engines, and when they became available, with Merlins.
Why wasnt the Fw190 built? because no neutral nation was awarded a licence to build it during the war, and because the production of the airframes were widely dispersed around germany, but not out from it. Czechoslovakia and Spain could build 109 airframes because they had the factories to do it. But no 190 factory was ever located out from Germany. I'm quite sure that the IAF would've loved to have some 190s instead of the toejamty Mezecs during the 1948 war.
Why wasnt the 190 copied by the victorious nation?...why should they do it?. They took the best design features of the 190 and they adopted them into their own designs. The prop plane technology was already a dead end anyway.
Why wasnt the Me262 or the He162 copied?. The Me262 WAS copied by the russians; the americans and British took the best design features of the plane (the wing being the most prominent example) and got them into their own designs. It would be idiotic to say the least to replace their own indigenous projects with a foreign design; it would be not worth the cost. The russians did it, because when the war stopped their jet technology&research was very limited to say the least.
Add to that, the fact that after V-day and until the Korean war,the Western nations went into a major disarmament. Why should they start building a German design?. There were several ground breaking planes to build, including the amazing Go-229 (wich was going to be by far the best thing flying in 1946), yet they didnt do it. The reasons are pretty evident and plain to see, even for someone like you, who doesnt want to see them.