Ya'll stay trying to force Future into conversations where he doesn't belong. I don't even mean this as a diss, but Future is more comparable to a Missy Elliott than an Outkast, Nas, Jay Z, or even a Wayne.
Like Missy, he's an all around artist. He raps, but also does this melodic rap or attempts at singing. Nobody would put Missy in a GOAT rapper conversation because bars are not where she shines. It is flows and inventing flows and melody where she shines as a rapper. As an artist, like Missy, Future has written for other artists mainly R&B. Like Missy Future's catalog could probably give a lot of rappers a run, but again that alone isn't putting him in GOAT conversations. Like Missy, he's very influential, but again, doesn't put him up there with GOATs.