A lot of the catamaran
designs out there are a too fat & overloaded in order to gain sufficient VMG when sailing at say 120 degrees AWA. Vs. being able to sail deeper angles, in order to get better VMG.
This can be due to their/his; displacement
shapes & underwater profiles (foils), lack of sufficient sail area vs. weight or wetted surface, & or aerodynamic drag of the vessel, making a design slow when it comes to downwind work.
So that may be what the OP is referring to.
In theory, you might be able to move your aft most stays forward, & add a set of full strength running backstays
. So that they'd take the load in the place of a fixed backstay. But you'd need a professional (NA) in order to do the math, & make such design changes. As such a change would significanly alter where the loads are on the boat, as well as the rig.
Also, by switching to runners such as this, if you goof (when handling them), on a tack or gybe, then down comes the rig.