I just want them to add a simple "organize inventory" button that will automatically sort my inventory so it isn't full of holes where I dropped/used/sold items and haven't bothered to painstakingly drag and drop everything to fill them back in so that whenever I pick up something new it isn't hidden randomly in the middle of all my stuff.
They kinda sorta do. Go to the Sort dropdown. Select something other than what it is currently on. It auto-sorts then, filling in your holes. If you want to go from Types to Weight and then Types again, that's usually how I do it.