turkey has been trying to muscle its way back into the f-35 program even after acquiring the s400 (hence the talks about the weird agreement to store the s400 on a usa base in turkey), so i dont think they came to that conclusion   thats the same thing they said about the f-111 (whose development program was as bad as the f-35s on a money/time perspective) it went on to do extremely well in desert storm
United States