Sure, but Delphi was released in 1995 as the first version, whereas this was something I was programming in 1992 (and I came late to the party with Nextstep 3).

https://en.wikipedia.org/wiki/History_of_Delphi_(software)

Visual Basic came out in 1991, by which time Nextstep was already at version 2.1

So yes, these things existed, but after Next had demonstrated them.