What single-point accountability actually changes
Under a split appointment, the interface between design and construction is a commercial boundary - and every ambiguity at that boundary becomes a conversation about whose responsibility it is, usually while the programme is running. Under a single contract that boundary is internal. The detail gets resolved by the people who drew it and the people who will build it, in the same room, without a variation attached. Most of the time saved on a turnkey project is saved there.
