That's the question Im struggling with, since the crank still has a lot of counterweight there is no real advantage weight wise.
Sound, yes.
Exhaust manifold packaging might be another as 1&3/2&4 can be paired on each bank. ( the 'old' 4 cyl pairs 1&4/2&3 ).
Thumbnail, This 'might' be the firing order for the Ford 180° engine on RHS of dwg, there are several other options.
And why bother at all if the A52XS can make more peak power and torque.
Was this literally just an experiment?