Things are moving so quickly in EVs and especially in software-defined driving dynamics. Such a software update would simply be impossible in a traditional car. This is a car already for retail sale in Mexico. They were probably pretty confident in the dynamics. Even the best plans don't always go accordingly.
There do seem to be some underlying engineering limitations that translate to Shark not offering the same level of off-road capability as some full-featured ICE utes.
video goes into some detail regarding Shark's torque deficit relative to ICE vehicles with low-range gearing and differential locks and how that relates to the limitations encountered whilst hill-climbing. The FCB Leopard 5 that Shark is based on does have differential locks, so there is clearly some cost-cutting and tailoring to specific intended use scenarios going on.
So far as I can tell, BYD Shark is indeed a highly compelling package, including more off-road capability than the great majority of prospective owners will ever require. But it is nonetheless a somewhat
different package compared to the mid- and upper-spec ICE utes that it is most directly competing against, which means that BYD has the additional challenge of crafting a unique narrative about this vehicle that effectively communicates what it is and who it is for.