The Chinese copy of the Russian engine was overhauled for too short a time? ? Which Russian engine are you talking about? Can you clarify so that I can check what you said? ?What kind of experts? some name please.
AT least it's not the case of engine : the time detween overhaul of the chinese copy of russian engine is so small... And they had to work for 20+ years and spend billions to have a ppor copy.
25 years ago a french navy officier had the opportulity to visit a brand new chinese frigate (I think it was during the visit of the ship in a french overseas harbour. Maybe new caledona, I don't remember) : he was so suprised to see that some internal partitions were made of ply wood ! So nice externaly, but shitty internaly.
Honnestly, as they struggle to have access to the best microships of the world (built in.... Taiwan !!! ), their electronic devices are unlikely to be at the top level.
The internal fuel range of the jf-17 exceeds that of Mirage 2000 and MiG-29. You mean Mirage 2000, MiG-29's range is not as good as MiG-21? ?JF17 is a cost effective solution to replace mig21. But it's main weakness is the same than Mig21 one : small range.
It's just impossible for a US, a russian, a french, a chinese LIGHT fighter to have the capacity of a MEDIUM or HEAVY one. JF17 is a nice LIGHT fighter, that's all.