We can make our own Kashtan with DRDO VSHORAD and a newer gun. A gun based CWIS is probably still necessary due to drones.More layers are always better.
Even on land, we are not just relying on updated bofors Anti air gun with radar and fcs.
But also working on.
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Bhargavastra (counter drone system) - Wikipedia
en.wikipedia.org
Plus ak630 on our ships have Effective range between 2-3km.
Drdo vshorad has 6km max range.
So it adds another layer, a more longer layer of point defense than ak630.
But I'm not against the idea of more anti air auto cannons on ship too.
Oto melara 76mm being put on our modern ships is already designed to engaged subsonic targets, and some effectiveness against low supersonic targets too.
Another 30-50mm one to compliment it, won't be a bad idea.
Also the vshorad launchers takes quite less space compared to auto cannons.
And quite easier to add on superstructure of ships.
We should also make our own SeaRAM with ASRAAMs. Both should be available for use depending on the ship.