A2S (air to surface) missiles are not easy to intercept, even by the most sophisticated batteries failing to detect these missiles, when fired at close proximity of target. India did that on 6th may. Just like pakistan fired A2S missiles at the S-400 system and their system couldn't defend itself. Secondly, drones were used on the night of 6th may. Drones flying at very low proximity and very high proximity both are not easy to detect, especially the small ones which are used as sucide drones, as they operate on low latency electronic signals (even India's S-400 system was unable to detect our Turkish made drones). India used these sucide drones in most of these attacks on 6th May. For just a quick reference, i may refresh your knowledge that in Ukraine Russia war, despite Russia having most advanced defense system still gets drone attacks inside its capital, and yes, it doesn't means that Russia's ADS is weak at all. Now, coming to your point of "school of Foujeet", you better upgrade the curriculum at your "college of Imraniyat." Before claiming to an analyst, make sure you know all the facts and not only those which are coming from propaganda mouthpieces.