As the article says that the non availability of above features on P-8As are offset by the fact that there are a no. of US satellites & other reconnaissance planes doing this job, there was no need for it, besides the important thing is that the range of P-8Is are somewhat limited w.r.t P-8As & also certain on-board features, this was understandable as US will certainly not give advance tech. to India without the signing of CISMOA by the latter, but still IN's need are more than met by these advance birds.
From what I understand, if you do a plane to plane comparison, the P-8Is are more advanced than the P-8As, because it has more equipment, like the aft radar that @Abingdonboy mentioned, and also a MAD sensor. The US doesn't need these goodies, because their birds work in tandem with a helluva lot of supporting systems like a galaxy of satellites, and UAVs. So the P8-As in the service of the USN may be able to achieve more, working with all the rest of their networked systems. But we possibly have the finest ASW aircraft on the planet. (Hooray for bragging rights!)
I'm not sure why the USN did not want the MAD though.
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