People have different layouts in toolboxes, sheds, garages, kitchens, bathrooms, etc. Whatever fits them best. They highlight main features and hide the rest in shelves. But when it comes to UX, everything must have its very fixed special pedestal for some reason. Not your fault, the whole UX thing is absurd from inventory management pov. We used customizable toolbars all the time before someone decided that we are too dumb for that. We still make bookmarks, pin apps to start menus, arrange apps on dashboards. Users aren’t dumb, the premise is.