Nationalist Value

From the Conquest of the Past in The History of Great Britain  by Michael Faletra.

Page 123- "This model would see Geoffrey as a compiler, providing access to native Welsh traditions to larger audiences; it is not difficult to see this editor-Geoffrey as preserving the nativist bias of his source materials, and thus to see the historian as fitting easily within a pro-Welsh (and essentially anti-Norman) camp"

Page 124- "If we accept the implications of Neil Wright’s arguments that Geoffrey significantly manipulates all the source materials we can identify, it becomes easier to see Geoffrey as a true compositeur: he is by and large fabricating the past that he is narrating. Indeed, it is still very much an open question how much of The History is completely the product of Geoffrey’s imagination; at the very least, it seems he probably patched together a variety of Welsh, Breton, and Latin sources, organizing them as it suited his purposes and filling in the gaps with fabricated details when necessary"

Falerta and Loomis texts establish Geoffrey's historical shortcuts in his work very well. However what is the value in viewing his work as a critical piece of British folklore that helps create a sense of nationalism with a shared "history?"