This game was supposed to be played in groups. The introduction of the PUS changed everything. No need for buffers anymore. Only healers and Duffers.
Without the need of a party sins could now go to most places practically undetected. Since they don't need to have a buffer behind them to rebuff them
when they get maliced and they cure themself.
Plus, Defense armors had their disadvantages too. You had to give up on some precious normal def and stats (str, dex, hp). So it wasn't that unfair.