When you're outnumbered, it's just easier to work with a qualitatively superior force than a force that's less qualitatively superior but more numerous.Oh please! What a logic ... the J-10CE is currently the best they can get or do you suggest since they won't get J-20s in large numbers to overwhelm the IAF they should better leave it and surrender?
Yes, they will never get an air force comparable in size to the IAF but they also won't get this type of "qualitatively superior to every single Indian aircraft", what the PAF however can do is, to field a large enough fleet than any potential conflict with any possible opponent costs too much and here surely a larger number of J-10CE is anyway better than a lower.
The doctrine when you're outnumbered is that you do attacks of opportunity and do hit and runs. For this to actually work, however, you either need a terrain advantage (which doesn't come into play with aircraft) or something that can achieve a kill (i.e, get close enough to get a lethal hit), manage to survive the engagement (be agile enough to avoid counterattacks), and be able to escape. You attempt to create defeat-in-detail scenarios, wherein segments of InAF sorties get overrun by the PAKAF, then the PAKAF runs before the rest of the InAF deployed can come in for revenge.
In this situation, TVC helps because it allows the proposed J-10DE to extend the envelope of a successful attack (by allowing maneuvers not otherwise possible), it reduces the envelope within which the enemy can shoot down the J-10DE (evasive maneuvers without concern for recovery), and if the engine is higher thrust than the WS-10s already being used on the J-10s, it allows the J-10DE to escape faster.
@Deino
Actually, to put it another way, when you're outnumbered or otherwise outmatched, what you absolutely don't want to do is to fight a war of attrition. It's what the other side wants--they take casualties at a 2:1 or 1:2 ratio, but it doesn't matter at the end, because at the very end, you have no men / materiel left, while they still have an army.
What the outnumbered side wants to do, rather, is to fight a war of maneuver, wherein tactics, operations, etc, are designed to give you outsize kill-loss ratios while preserving your forces. TVC is better suited for this war of maneuver in that by increasing the level of superiority of your aircraft, you deal more damage and take less losses.
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