If you didn’t guess it already, that’s where this mod comes in. One of the reasons is how slow it is to jump off (or jump back on) your horse, especially in the frenzy of battle.
The problem with horses is they feel largely inconvenient. They can speed up travel time, especially early on when you don’t have fast travel access for the whole map. Horses: now a little less of an inconvenience to you! These mods will do just that by introducing new features or quality-of-life improvements to your game. For others, modding is a way to constantly add unique features to the game that enhance the experience in some way or another. For some people, the goal is adding more challenges to a game that is nearing its 10th birthday this year.
Why do you mod Skyrim? There are no wrong answers and almost infinite choices.
With a game as old as Skyrim, mods that create a new experience are a breath of fresh air.