Should Hobbit have been more rewritten?

[Tuor of Gondolin]

Should JRRT have done more in reconciling the worlds of The Hobbit and LOTR? It's well-known that he adjusted the Riddle Game and took out some asides to the reader but, as has been noted in several places on The Entmoot, there are still some inconsistencies. Given Tolkien's "niggling" over aspects of his Middle-earth tree (including phases of the moon) two related questions arise: Should more adjustments have been made, and if so, what and how?
Three examples are the cockney accents of the trolls, the stone giants (literally) hurling giant rocks around, and Roac the Raven speaking to Thorin. I don't think there is any suggestion that Roac is akin to the Great Eagles (maia?) so he shouldn't speak, perhaps just carry messages to Thorin's relatives. But this would take away both the wise advice he gives, and Thorin ignores, and make it less of a "fairy tale children's book."

Opinions? Was it better to essentially leave The Hobbit alone or should it have been aligned more to Middle-earth in general?