So you are claiming that even though Samsung has had this feature for years, Apple developed this identical feature for iPad in a complete vacuum and independently of what Samsung and Microsoft are doing?
None of them can really claim to be working in vacuum given it's been on the previous generation* of computing devices for 20years.
Also unless they do something really novel to make it work better for the form factor or workflow we shouldn't let any of them get away with calling it innovative either.
*yes I'm lumping in desktop and laptop as one generation.