Really sausages I don't they have such capablity
Don't supplies get fkd during war?
They are making 100 jets each year. Right now. Share of J-20 in that production is bound to increase.
The biggest advantage of 5th gen- being LO is also its biggest weakness. Once that cover is blown- it is not super agile or nor can it carry a super punchy payload to take on a loaded foe.
It also begs the question- what is stopping us from mounting L band radars on Mk2 & AWACS & on the ground?
J20 vs Mk2 on CAP
The J20 is detected by AWACS/ground-based L band radar whilst still in BVR regime where the odds favour Mk2 against any missile J20 can fire- Mk2 descends low, gets a continuous feed of enemy coordinates and gets to within WVR of J20 by engaging in nape of the earth flying. Let's remember stealth is also afforded by obfuscating Mk2 in ground clutter. Within WVR J20's stealth is no good, it is not very agile, cannot carry a truck-load of ammo/missiles whilst Mk2 is comparatively well kitted for the fight and much more manoeuvrable. It should be an easy kill for the Mk2.
J20 vs AMCA on CAP
Only advantage from above scenario is AMCA can fly straight to the engagement zone without low-level flying and consequent fuel penalty. But again biggest disadvantage from above is when it gets to WVR it will carry half-a$$ed missiles in its IWB (if you are carrying weapons on external stations then might as well send the Mk2) so what is the advantage of arriving at that point with more fuel in the tank? Now if you bring in the fact that Chinese L band radars would be continuously tracking AMCA all through its flight then you can't even fly high- will have to again resort to low level flying then what is thee advantage of AMCA? Unless stealth is a 100% guaranteed throughout the ingress and egress of the mission there is no significant advantage to 5th gen.
Also since Mk2 is cheaper we can have more of them on CAP & send 3 of them to counter J20 vs may be 1 of AMCA.
Low level flying only works in mountains these days because in the plains, using ground clutter to hide is not a viable strategy anymore because radars these days can usually track you despite the clutter. Its only viable in the mountains where you can literally hide behind the mountain.
AMCA is still much better because it won't get shot at till its in WVR and within IIR range. 4th gen just won't be able to do that, unless they have the advantage of terrain masking, which they will have in only particular situations.
Another factor is that in any real world scenario, a 5th gen won't fly alone, rather it will fly as part of a strike package involving 4th gen fighters as well. In such a scenario, having an AMCA as the vanguard ensures that a non-emitting AMCA can get close to the enemy package, switch on its radar, fire a volley of BVRAAM at the enemy's 4th gen fighters and then bug out. Now, the enemy 4th gen is forced to go defensive and hence AMCA has managed to shave off the 4th gen component of the Chinese strike package and the J-20 are now alone and become more easy to attack by other jets in our formation, be they 4th gen or 5th gen. If ours are 4th gen, J-20 will similarly put our jets on the defensive and then it will have a choice of either bugging out (leading to a mission failure for the Chinese) or it can attempt to enter WVR with our 4th gen jets with an advantage (as our 4th gen are busy in evasive manuevers). If J20 controls the merge, it can hit and run, destroying our 4th gen fighters.
Now as long as we don't have AMCA, we don't have this capability. Terrain masking won't work everytime, IAF will have to think about other innovative means to defend our airspace.