With the cost involved, future regulations are considered to avoid further re engineering early on in the design,
Lower compression and turbocharging is the way cars approach the co2 and other stringent regulation,
Along with clutched main coolant pumps and oil pumps that drop pressure under acellerating all to reduce drag,
Luckily bike regulation is way behind, so the current design as you say gives us some room to optimise within the rules
The low ash lower viscosity oils for the wc also contribute,