Wow with just radars all 5th gen tech will go for a toss!! Really??
Then all countries like USA, France, Turkey, SoKo, Xina etc are fool of highest order for developing their own respective stealth 5th nd 6th gen vectors?? Heck why are we even developing AMCA if the much vouched stealth tech will be defeated by just mere Radars..
See detecting is one thing but one needs to balance between offensive nd defensice tech.. Stealth fighters are force multipliers..enabling joint operations with 4th gen by SEAD nd also providing situational awareness to legacy platforms..neglecting them will seriously risks ceding air dominance to adversaries already fielding such aircrafts (xina holding in huge nos)
Over focusing on just radars at the expense of fighters leaves a gaping hole in offensive nd defensive capabilities..
Radars nd associated ADS are static or semi mobile nd are vulnerable to long-range precision strikes by the very stealth platforms..which can degrade AD networks even before they become effective..
The whole idea of Stealth fighters became eminent to degrade the threat of long range multilayered ADS where 4th gen fighters are sitting ducks.. sure 5th gen will also be detected but the difference between the range of detection btwn a fully loaded 4th gen fighters with VLO stealth fighters will be huge nd will ultimately make the distinction between achieving mission objectives or failing with high attrition rate.. thus one can't scorn the value of stealth fighters in lieu of some Radars or ADS.
Here's a better representation of 4th gen nd 5th gen nd it's impact on tactics nd doctrines..
View attachment 37746
Now coming to the India vs Pak scenario PAF with J35..it will give them the opportunity to penetrate nd target S400 nd other ADS envelope from a safe distance.. once S400 air cover is gone PAF can act more manfully mounting offensive targeting IAF 4th gen fighters CAPs causing high attrition rate.. remember it was S400 which made PAF go into hiding this time for whole hours of fighting after 7th may as they couldn't venture anywhere near the border to respond to indian airstrikes..so IAF will need it's own deterrence in form of stealth fighters ( F35/Su57) to keep PAF J35 at bay..