I have been playing since launch, beta tested vanilla and like half of the xpacks. you should be enjoying downloading a new addon to gain a new feature/display. the fact your unhappy about UI design/layout freedom probably means your not at the point where you need those things yet. watching a streamer and he has 90 mods installed does not mean you need all or even any of them. blizzard does add entire addons into the base game, though it is a slow process. The raid markers, and all of the symbols, were originally an addon. complaining about addons because there are too many to choose from or too hard to setup is a pretty poor argument. the reason wow has lasted over other mmos is because of the mod support. With mod support I was playing wow with an xbox controllers for all of BFA before official game pad support was added.
TLDR: Get gud, addons are optional and if your playing wow for its pvp then i think your beyond forums level help