DIO changed a lot, Soff DIO is more like a keep away character without being a zoner, Son DIO is pure combo machine now and really good in the corner. The life nerf is to balance it with his offensive power and don't forget he got life sucking move.
Pucci disk steal nerf was needed as not everyone could easily knock him down and the MiH changes forces people to use C-Moon.
Akira's offence has become really really good, but don't forget Jonathan and special mention for Hol horse (like he needed the buff he got).