Britannia offered a place to bring foreign leaders and British industrial representatives together during royal visits. A monarch outside party politics could obtain access and welcome that supported those meetings. The banquet and reception spaces mattered because they put people able to negotiate commercial arrangements in the same room. A proposed successor combining a royal yacht with a reserve hospital role would preserve that diplomatic venue while giving it an additional emergency purpose. This is the case made for a replacement, rather than evidence that such a ship was ordered.
Notable Point · 5:24:11-5:26:05
Britannia's combined soft-power and hospital-ship value
A replacement royal yacht could have combined politically neutral diplomatic access with reserve medical capability.