You may be interested in this post by JasonWW who compared a domed and “sliced” (not a true dedome but about as good as it gets on XHP70) emitter in a Convoy L6.
The benefits are: Beam is somewhat improved. Throw is somewhat improved. Lumens are lost. JasonWW’s numbers there are “ceiling bounce” numbers, meaning they’re useful for the direct comparison but we don’t have any way to know what the actual lumen/lux numbers are. This would indicate a 14% to 18% lumen drop from slicing.
From post #8 in the same thread I linked above:
This would show a 24% increase in throw.