PN presently operates 5 subs and by 2030 PN will be replacing all of them with 8 Hangor class subs and as of now PN has not disclosed any other plans for induct more subs.
Whereas by 2030 IN will be having 6 Scorpène-class submarine and 6 Type-214 under production, further IN will be either inducting or building indigenous SSKs, SSNs along with larger SSBNs.
If Pakistan plans have a powerful submarine to counter IN surface fleet then PN needs to inducts more Subs in short time.
Problem with PN is who is going to finance it, IN is getting more attention and funding, whereas PN is in short of funding.