Because she was played by Kristin Scott Thomas?
No, that wouldn’t be it, since Gloucester was played by Ian McKellen. He’d prefer Rivers (Robert Downey Jr.).
Shakespeare’s whole Henriad-plus-Wars-of-the-Roses series was apparently intended to present national propaganda – Tudor propaganda – in the story arc. When Henry Bolingbroke (Henry IV) forces his incompetent cousin Richard II off the throne, he commits an Original Sin that rots the state worse with every generation, until Henry Tudor finally restores the proper order of things and brings peace and stability.
Which is approximately what did happen, from the POV of the common Englishman (and overlooking all the Protestant-Catholic tension under the Tudors).
Yes, that would be a different take on the character . . .