I felt the exact same way. The entire side quest chain at the end of the game with the three 'things' really felt like it should have been voiced. The fact that all the bond cutscenes weren't voiced either is really strange. If pillars 2 can voice every line in game there's no excuse for Atlus imo.

I could beat him up easily

Why not just use Sunshine and use that to play on the deck so you have a bigger screen and a better controller?