Not at all. Your post, unlike some others, is quite sensible.
Mig-21 bison's RCS is not known. Mig-21's RCS without RAM is around 3m2. LCA's RCS should be at least 10 times better than a Mig-21 without RAM.
B-2 does not handle SEAD.
While their SAM systems are currently not up to the mark, their early warning systems are first class. They have taken deliveries of the TPS-77 radar systems which are PESA. We may have to fear the day they may receive HQ-15/18 based systems from China.
SEAD aircraft never fly beyond AD altitude. Akash and Spada 2000 have an altitude limit of 18Km. Jaguars don't cross 12 Km and LCA is restricted to 15Km. It is preferable to fly closer to the ground for other benefits.
Also, while you mention EW, the LCA Mk2's EW will be inferior to what will go on aircraft like Jaguar and MKI, at least in terms of antenna type.
True the B2 was not meant to handle SEAD, but it is a role well within the capabilities of this legend. Its penetration ability into the modern air defence has remained unchallenged for the past 20-24 years. Of course now there are the UCAVs and Harpys to better perform the role.
And yes the Spada may have engagement altitude of upto 18 km but it will be seriously constrained to engage targets even 15-18 km away horizontally at this altitude because of the fact that it has a pretty short range i.e. 25km. Another point you will have to consider is that SEAD is not conducted by free fall munitions but rather by AG missiles. So you dont need to fly right on top to take down a SAM site. it is still possible to launch munitions while staying outside the AD envelope. And yes, if the PAF gets its hands on the HQ18, the equation will change dramatically.
About your point that the Pak has excellent radars to detect our aircraft, it really does not matter if they cannot do anything about the intrusion. Moreover in SEAD missions aimed at static targets it does not matter if the enemy turns off its radar, the few seconds it kept them on is enough to identify the location. This changes for the worse if the Sam systems are mobile like the Patriot battery.
And as far as flying low is concerned, it does present the advantage of being detectable at much shorter range than at normal altitude. Also even though AWACS and airborne fighters can detect the aircraft, the radar is hard pressed to track the supersonic aircraft in the midst of additional noise from the surface, much less guide a BVR towards it. So I do stand corrected in that low level missions are better. thanks for that.
As far as EW is concerned there is no way the EW/Jammer suite of Lca can match that of the Mki or the Growler. That isnt my reason for stating this point. This is something the Rafale with its Spectra and in the future with Mki+AESA+Elta pod will be able to exploit. This i repeat has nothing to do with LCA. Though I am not really sure if the Engine of Jaguar can provide enough power to field a powerfull EW package.
Please note that my arguements are not really to state that the Lca is an ideal platform for SEAD. As I've come to learn, it might be not a feasible aircraft for thos role. But the fact does remain that if the IAF is presented with an opportunity to conduct SEAD mission and has only LCA available for tasking, it will commit it to the mission, feasible or not.
And as far as high altitude SEAD is concerned, perhaps there is still a place for the Mig 25 and the like to exist. Who knows, the new x-37/47 could be a new platform with a SEAD role, using hypersonic speed and insane altitude as shields.
