Let's stick to facts.
US Navy SSNs are the main threat, both by quality and numbers. There's just a handful of top-notch British and French subs and Russians are no longer considered enemies (anyway only 5 Yasen-M). There are 24 Virginias built so far and with SSN-X significantly delayed (as expected) and 688i being phased out, we'll probably see another 25 added in the next 10 or so years. Block IV boat takes 4-5 years from keel laying to commissioning, Brits, French and Russians are slower - 8-10 years.
If 093B indeed is mass produced I see two possibilities:
- 095 is still a decade away from mass production and Navy needs numbers (both boats and personnel)
- 093B is at least as good as 688i and, if some components from 095 are introduced, on level with early VAs and Astutes.
Otherwise mass production does not make sense.