You can switch off the radar if you detect a missile coming, you can't switch off big ass rcs.
With AESA multi-beams, radar doesn't need to be switched off.
When a missile is detected, it has to be tracked continiously to see if it is still homing or lost the target.
The ISTAR jet can also try all types of EW, DIRCM & even DEW, which i think might be less costly than using RAS, RAM.
Although i agree giving some geometric treatment to ISTAR bcoz that alone reduces RCS a lot. So either ADA should design & HAL should make it, otherwise Embraer, Bombardier, Gulfstream, SAAB, etc would have to be contacted.
The ISTAR jets have fighter escorts & SAMs around them, so incoming VLR-SAMs/AAMs could be downed.
The VLR-SAMs & AAMs currently have 400 Km range.
Suppose, if ISTAR can stay 500 Km away from border & detetct targets at 600-800 Km, that's 100-300Km beyond border, then it's enough. No stealth needed & money is saved.
If a stealth jet somehow manages sneaks 100-150 Km into our area & launches VLR-AAM, then also it could be downed, jammed.
Plus a bomber varient that can carry standoff munitions like rundram 3 in its iwb, and still can get close to border or even cross it for deeper( 500 inside enemy
territory) strike inside enemy territory.
Also maritime anti ship role.
We can't handle AMCA on time, you want a B-21 like bomber with telephone pole sized Rudram-3?
Its CAPEX & OPEX would be very high.
If we can't tame a buffalo,

how can we expect an elephant?
We have handled Pakistan easily.
But AFAIK, our doctrine with China is not going deep there but just defend Ladakh & Arunachal Pradesh, bcoz crossing border is considered major escalation. Then China will get free hand reasons to strike deep in India, which will be a disaster as Chine leads us technically & numerically.
Hence after Naval Tu-22 we didn't go for bomber.
I said before many times that i personally don't believe in a UCAV which can't defend itself once/if detected.
A big boomerang shaped jet like B-21 is a big technical risk. But USA can take it bcoz -
- it is decades ahead of its adversaries in R&D.
- it has entire ecosystem of MIC.
- it has its own global bases.
- it has global allies.
- it has global market.
China would attack West in Pacific - Guam, Hawai, SE Asian allies, Australia. Hence it is making J-36 & B-21 like H-20 bomber.
We have supersonic

.
We're researching on hypersonic missiles.
So we can use IRBMs with different guidance & terminal seekers for different targets.
We can make subsonic cruise missiles also.
Also this.
New images emerge of China's CH-7 Long-Endurance Drone that seem to indicate it undergoing testing in readiness for completion.
interestingengineering.com
And this.
See the latest RQ-180 stories from The War Zone. See news, trends, tips, reviews and more at The War Zone.
www.twz.com
The future is of drones, so all types will be eventually made, but funding with time for different programs have to be prioritized.
USA is literally world police & China is expansionist, & both are heading towards conflict due to Taiwan & South China Sea, hence they need all types of platforms & weapons.
Our situation is not that severe.
However, i said earlier that these boomerangs are suited for subsonic tasks like recon, EW, expendable patrol, etc. So with a suitable engine with enough electricity, EW, recon drones can be made.
But AWACS/JSTARS/ISTAR capability needs far more electricity.