[RUnconcerned]

This is primarily for computer chess, where the draw rate is even higher than in super-GM level chess. It's an alternative to having engines play from a preset position where one side starts with a significant advantage, which is what usually happens in computer chess tournaments. It's essentially the subset of Chess960 positions that don't need modifications to the castling rule, and thus should work on all engines without requiring any changes to the code.

[tomku]

It's not quite a subset of Chess960 positions, because Chess324 allows different piece layouts between white and black and Chess960 does not.

Edit: A comment further down points out that only 18 of the 324 positions are symmetrical, so the vast majority of Chess324 positions could not happen in 960.

[kibwen]

An alternative is just to stop bending over backwards solely for the sake of supporting castling, which is an inelegant hack in the first place.