If any player in Sortie own and Tier 4 Prime weapon, the AI change in the bosses just makes each fight much more difficult and slower, with NO benefit in drop rate.

This is just a punishment for players who work hard on content. Its a slap in the face... frankly it kills my motivation to make a prime weapon.. in which case why bother playing anymore?

IF the AI change included is going to make the fights more difficult, then they should have a corresponding reward.

if its nothing but a punishment, then.. this is a really poor decision for game design. its more aimed at ending participation than anything. its a new low in choosing ways to artificially slow progression.