I think it depends on what one is looking for in Proust. Born 25 January in Paris. Thereafter the copyrights passed to the Royal Literary Fund. Maugham was one of the most significant travel writers of the inter-war years, and can be compared with contemporaries such as Evelyn Waugh and Freya Stark. Do we kick authorial intention out the window completely?
Note the slight clumsiness, which seems to have inflected everything Maugham ever wrote.
From your description of yourself: Maugham himself, as a narrator, has never exhibited the sexual appetite towards his female characters that one would find in a Hemingway or Steinbeck. But I happened to notice in Maugham's Ten Novels and their Authors, he is frank about the seeming crush Hermann Melville had on Nathaniel Hawthorne, and the embarassment it may have caused the latter. And vice versa.
So I think Proust or Maugham or any writer is fair game in a certain sense.