Max range is only relevant if you are shooting from up high against a large target that is also high and dont defend.
The no escape zone of the meteor against a defending fighter target is 3 times that of an amraam and most likely far greater then the PL15.
This is patently untrue. There is no declassified data on Meteor, AIM-120C/D, and PL-12 information.
However there is the fact that both the US and China would have developed ramjet air to air missiles just like Meteor and evaluated their performance to determine best path of future generation air to air missiles. The Chinese future A2A weapons are still shrouded in secrecy. We have however received hints that at least the future systems include (but does not mean will be put into service) some form of missile truck platform using large aircraft for extremely long range weapons and combined with multi-missile gliders or dispensable drones. Other forms of extreme long range are similar to the missile once seen under the wings of J-16 now nearly half a decade ago. As for air combat, based on hints and leaks, it appears China's future direction is very networks UCAV heavy with missiles being similar to current range if not even shorter ranged but many stealthy drones doing the more frontline work with missile trucks based on Y-20 and H-6x or even J-16 launching the very heavier long range missiles.
Meteor is no better than AIM-120D and PL-15. It is nowhere even approaching 3 times the NEZ of AIM-120C and PL-12. Hardly even double the AIM-120D and PL-15 if I had to guess.
Americans would have played around with Meteors or developed their own ramjet A2A missiles and have decided to develop the AIM-260 and the latest hints suggest that the AIM-260 is NOT ramjet powered but dual pulse just like PL-15.
Both the US and China probably put many times more funding and brains towards developing a coherent future air combat strategy and weapons. Both regard ramjet as NOT the direction they want to head in. Both seem to be putting significant stock into networked UCAVs doing the majority of air combat in future and machine learning (based on data collecting and running wargames) outguns and outthinks any adversary still lobbing 150km-300km missiles at those extreme ranges (nowhere near NEZ) from expensive manned fighters. Both plan on using heavier aircraft to lob extremely long ranged missiles from far behind those frontlines. Both put stock into dual pulse air to air missiles.
US hasn't even bothered to buy and put into active service a single Meteor missile despite it being available for over 6 years now. The US often buys allied equipment. From Italian frigates to German tanks to British fighter aircraft. Why are they not buying this supa missile Meteor? Why are both the US and China who are at the forefront (at least with development programs and funding) of air to air missile development not bothering with fielding ramjet A2A missiles in large numbers? Clearly ramjet A2A missiles are simply too expensive and complex to be worth the trouble. Both these countries see a future in fielding tens of thousands of various A2A missiles, better if they can fit into future UCAVs and stealth fighters who can get well within 50km against pretty much all existing fighters. You don't need ramjet to get a kill with mach 3 to mach 4 PL-15 or AIM-120D at 50km range.
Longer ranged missiles beyond AIM-260, PL-15, and Meteor are missiles like that PL-xx from J-16, AIM-54, and R-37M. These missiles are HUGE in volume. They carry far more dead weight than the newest "medium range" towards the longer half of their range. Neither of those three long range missiles are air breathing or multistage. They are nowhere near as effective for taking on fighters and future UCAVs. At this >200km it begins to make sense for ramjet particularly against slow and large targets.
Now think about why the US and China haven't developed ramjet powered long range A2A missiles that replace things like PL-xx and AIM-54. The reason is obvious. DEW and interceptor missiles are either ready or in development. PL-10 can intercept incoming missiles. It has the kinematic performance to, the rest of the problem is in sensors. In no time, both US and Chinese aircraft would have some working Active Protection System whether it is drones based, SRAAM based, or DEW. A ramjet powered A2A missile is probably approaching 2x the cost of a more conventional one since the ramjet missile itself also has a rocket motor already. China if it was ever interested in ramjet powered long range A2A missile could started with a YJ-12 or YJ-91 but without the need for powerful onboard electronics for ECCM and the warhead size of those missiles (over 5x the size of typical A2A missile warhead). Or as China probably did as well, simply modified PL-12 and PL-15 to be ramjet powered and develop some new software for those experimental missiles.