i don’t know where you get the technical problems from, that would be speculation atleast compared to what devs have said
Z said they announced FoA way early in dev compared to before
He’s also been very open about the scope of the expansion and “feature creep” and polish
if you follow the dev announcement all these things have been freely communicated to us Fangs of Asterkarn Development Update - June 2025
this was already revealed to happen via item modifiers
moar cute non-combat pets and surprise secret celestial boss fights + hidden stuff to explore and find