The US with over 13000 manned fighters was in a place far ahead for most of the history of those 13000 fighters. China couldn't and didn't produce anywhere near that number of J-6/7/8 and imported fighters because it couldn't afford to. Even producing 10,000 J-10 and J-16 just to "catch up" to USAF and USN numbers is not something that can realistically be done even now. Not that it would be even a remotely sensible thing to consider.
The US need to station quite a lot of those fighters around the world although obviously the nominal force stationed in and around the US mainland is many times greater than China's fighter numbers. They have been industrialised and wealthy for a lot longer. They've also been the dominant military power for over half a century now. Why would anyone need to bring this number comparison into a debate about China's current production rates?
China shouldn't be aiming to match US fighter numbers. China would go broke trying. In any potential war scenario, the US can only bring about 11 carriers worth of fighters and whatever is stationed in bases near China. That number is far smaller than Chinese fighter numbers and those bases and carriers will be receiving a lot of firepower before those fighters can take off, and definitely before those fighters can land and rearm.
So if the case is just about increasing production rates, well there are economic costs to that and the people managing and deciding the rates have a better understanding of what's achievable for what cost and what could be considered enough.
@banjex why does it matter?
Why would China waste finite resources in spamming fighters? There are much more important things and the US could not bring that many fighters and what PLAAF and PLANAF have is already many times higher numbers than that. You people realise all fighters have actually pretty abysmal range right? Humans have not reached a technology level that allows planes to run for that long. Especially if a fighter is carrying ordinance and plans on turning a few times. This is why carriers are the ultimate offensive weapon and denying carriers closer range is all important for countries like China.
F-22s and F-35s by many accounts have horrifically bad serviceability rates and associated costs and downtime. People just imagine fighters being bomb trucks slogging it away non-stop when in reality out of 100 fighters maybe 20 are operational in status.
@sinophilia, we don't have all the details about the specifics of the threats so we can't make a good assessment on what would be an ideal production rate for fighters like J-10C, J-16, and J-20. We'd all like them to be built in great numbers but there are huge opportunity costs too. The current production rates that we have a clue of are already the highest behind the US. These production rates are themselves already impressive but of course not as impressive as China's ship building rate. That should say something about where priorities are.
If you compare the program speed and production - service rates of J-20 with T-50/Su-57 which was revealed around the same time as J-20, the J-20's rate is far more impressive. It's even many times better than the Su-35 production which Russia is totally committed to. Europe doesn't manufacture any fighters except Rafale now and that rate is maybe half of the J-10C's production rate and all France is building when it comes to fighters. The Indian Tejas and Swedish Gripen rates? When it comes to the US, it's just still many times better funded than China's programs. They have industrial power and the funding to achieve those production rates. Not much you can do because you'll run broke trying to match. You can only focus in other areas but thankfully, they don't have the range.
The US wants an extremely long ranged future carrier fighter that needs to flying into central China from third island chains and back to carrier. You can see they are not satisfied with what the F-35 can offer and hurrying these new replacement projects.