Wasn't the Hobbit meant for kids? Don't overanalyze it too much.. LOTR and Sim.......That's another story. Love all of it.....
To answer your question, yes, The Hobbit was definitely a much shorter, lighter, easier-reading kid-friendly book than TLOTR trilogy, which is a lot of where my frustration with The Hobbit movies come from. TLOTR books are dense and filled with a ton of lore, yet they were able to pull off their adaptation very well in a movie a piece, albeit very long movies, for the whole trilogy. Then, when The Hobbit was announced, I figured for sure they would shoot to package the whole thing in one long movie beings the nature of the book. Shoot, I would have maybe given them the benefit of the doubt to go two in order to allow them to milk it a bit more. However, when they decided to go three, that is when things really started to get out of hand for pretty much everyone and when something exciting to hear started to scream cash-grab, and the movies suffered because of it.
People need to also keep in mind that the number of movies decision was only part of why those movies didn't nearly work as well as their predecessors. There is a long detailed history of the production mess and studio interference behind the scenes that played probably equal a part. For instance, Guillermo del Toro was originally supposed to direct the movies and it was originally supposed to be less movies. However, after he backed out last minute, that is when they turned back to Peter Jackson who spent the whole production playing catch-up, so the movie always started on shaky ground. Then, the studio played a big part in pushing the movie to 3 movies against what the Jackson wanted. Lastly, I also still hold that the advancements in CGI between the two trilogies actually ended up hurting much of the action as it allowed Jackson to go a bit too over-the-top in that category, losing its verisimilitude, and in a way abusing the technology. I say some of the same things about the Star Wars prequel trilogy.
Anyway, here is a good article talking about a few of the issues if anyone is interested in reading:
Why didn't Jackson's Hobbit trilogy take off?
screenrant.com