I love me a full taskbar. Give me the option to pin an app I'll use often, and boy howdy will I pin a lot of apps. I don't think I've filled it up entirely in many years, though, but if that sounds ...
Want to switch back to full-color icons? Just repeat steps 1-3, but select Default instead of Clear. iOS 26 also lets you choose between always using Dark icons, automatically switching from Default ...