https://gamerant.com/ps-plus-premium...mpaign=GR-FB-P

"try to list disappointments from Asia Players :

1. If you got the PSN+ with discount before, you have to pay more to cover the past discount amount when upgrading from essential to extra/deluxe.
2. You cannot just upgrade to extra/deluxe for a certain period, you have to upgrade all if you have active PSN+.
3. The number of game in the extra/deluxe library is not as what Sony promoted (400+), for a game with different languages versions, different platform (ps3/ps4/ps5), original/remark/remaster, Sony will count it repeated

For the upgrade calculation, it is calculated daily."