While I did enjoy Tom Bombadil in the books, I’m not surprised he never made it into any adaptation. It’s this odd coda in the story which isn’t all that important to the overall plot. Sure, it helps to build the world out and show that there are strange things outside the power of the One Ring. But, he’s a Chekhov’s gun problem. Tolkien sets him up as this amazingly powerful entity, who could probably solve all the problems Middle Earth is facing and who promptly fucks right off for the rest of the story. And his tendency to fuck off is mentioned later to explain why he isn’t fixing anything. In the end, he serves no purpose for the story which cannot be easily dealt with otherwise. It just seems like Tolkien really wanted to include him somehow, stuffed him in and didn’t have a competent editor to say, “look Ronald, I know you love this character, but this bit really needs to be pulled.”