"Frigate" and "Destroyer" are all jhumla terms if you see the newest warships of the IN
6700 tons Nilgiri class "frigate" and 7500 tons Vizag class "destroyer"
with the major armament differences being that one has 8 less
, maybe smaller torpedoes and 2x ak-630 as compared to the other.
Also Gessler is right in last portion of his tweet, it is P-17B( called P-17A repeat order in MDL/GRSE transcripts ) that is the "destroyer" equivalent that will keep the yards humming till they get the NGD contract in 2030s
Let's hope contract for P17B and all comes before the last Nilgiri is rolled out in early 2027
Thing is, while Frigates get bigger, Destroyers have been getting
even bigger. We're just locked in so far because we couldn't stray too far from the Delhi lineage. Pretty much everyone is going for their next-gen destroyers in the 10-15k ton range. US, China, Japan, South Korea (already have), Germany, UK, Italy, and our own NGD is also rumoured to be 11-13k tons.
That aside, it all comes down to how many VLS we can sail how far & how quickly. What we call the ships is irrelevant. Our destroyers are actually pretty poorly fitted out in terms of magazine depth - all because of a lack of sufficient VLS numbers. In turn because of lack of a universal VLS because of all the foreign-held IPs on weapons on which we have no design control.
We plan to fight the PLAN in the Indo-Pacific, but our Destroyers are fitted out like post-Cold War European ones that had little to no enemies to fight. Totally out of depth with what the environment calls for.
So P17A having only 8 BrahMos less than P15B and having the same number of SAMs doesn't mean our Frigates are almost as well-armed as our Destroyers -
rather, it means our Destroyers are as poorly armed as our Frigates. That's a cause for concern, not celebration.
There is a rumour that P-17B could displace around 8000 tons and be more 'weapon intensive' than P-17A. If that is true, then it could make up for the lack of DDG inductions over the next decade. Unfortunately, if the P17B design strays too far from 17A, it would mean we wouldn't be able to induct them before the next 8+ years anyway.
Till then, the 7 x P17As will be our only somewhat survivable/capable inductions (Batch-3/4 Talwars are already outdated due to lack of APAR...plus they (except maybe Batch-4) can't cooperatively engage targets with our indigenous PSCs due to Russian CMS).
If you ask me, after the 2 x Batch4 Talwars are delivered, I think it would be smart to bring GSL onboard as a 3rd yard building P-17B alongside MDL & GRSE. In the future, we need to free MDL up completely to build DDGs alone.