I have been using an iPad for years and every fucking time I accidentally trigger the creation of a second window I have to flail around for a while before I can figure out how to get rid of it. Presumably there are people who deliberately create multiple windows on these things and actually do serious enough work on them that this is useful, "my experiences with trying to ditch my lappy for 100% ipad" is definitely a genre of blog post.
I don't have a "multitasking" section in "home screen & dock". Possibly because I have an old ipad that constantly fails to update past 15.7 for some damn reason. Guess I get to keep cursing this feature.