Lack of Shown combat in book series

First time posting in this subreddit so I’m not sure if I’m following all the rules so if I broke some I apologize,let me know and I’ll change to fix it. (Also a bit of lead up before the question feel free to skip to the bottom to get right to the question)

To start off I was never really that interested in dune before the second movie came out, I always knew that Dune was one of those “Greats of Sci-Fi” but I never really had the desire to explore the series as I heard from my father that the first movies were not good at all. So when all the hype came up about Dune 2 I “gave in” to the hype and decided to watch the first movie the day before I went to the movies with my father to see the second one and within that 48 hours I was blown away with the idea of Dune, the movies captivated me so much with its storytelling that the next day I went and bought myself a copy of Dune and immediately started reading it(and all other books up to God emperor of dune), and with all adaptations I began to immediately notice the differences between the two and I enjoy both so much but what I still have trouble wrapping my head around with the books (besides the philosophy that hurts my brain) is why Frank Herbert doesnt touch on most of the larger combat aspects of his works, The attack of the Harkonnen in the night, The MASSIVE battle to capture the Emperor, I mean hell Maud’Dibs Jihad which we are told kills 61 billion people happens between the two books, none I’m not saying we needed a books showing the Jihad and I’m also aware that originally Dune messiah was only written because people didn’t seem to understand true point of Dune which was the power dangers of a Cult of personality. But it seems so odd to me that it almost feels like he goes out of his way to avoid showing these larger battles that I felt the need to post and ask if someone had the answer.

Apologies for the VERY meandering style of asking the question.

Is the reason the books don’t touch on the particulars of the larger battles a further example of the philosophical focus of the dune series or is it possible Frank didn’t feel comfortable with that kind of writing? I feel like the answer is that he didn’t feel it was necessary but then the question is why? Did the scenes of battle that were shown in the movies take away anything or just add more context to what’s going on? Would love to hear people’s opinions as I feel like I’m going in circles.