Yes it's a landmark achievement, congrats bros!
I remember in older threads (early last year) about the new subs I talked far more about them being used as second strike strategic force, together with Babur-III, possible Beidou usage, etc., as opposed to them being used in naval warfare. Just as Israeli built their deterrent using Dolphin-class sub as platform for their SLCM, in my opinion both PN and IDF are doing things effectively to counter respective opponent who are:
- Regional, not inter-continental
- Limited firepower i.e. fission stockpile only (Israel's opponents aren't even nuclear).
The combination of Pakistani firepower (2.1 megaton, more than twice that of opponent) + Babur SLCM + AIP-enhanced conventional subs shall be an effective deterrent.
http://www.nti.org/analysis/articles/india-nuclear-disarmament/
http://www.nti.org/analysis/articles/pakistan-nuclear-disarmament/