The concept of a special zone where things are not the same as in normal reality is merely a shared motif.
So while I don't agree that it's a shameless remake, I would say the most distinctive thing about it is the setting, and so to some extent it's a fair cop.
By contrast, the Zone in Annihilation is very overtly supernatural, and in very specific ways that are important to the point it's trying to make - merging and recombining humans and the problems that face them, and manifesting internal struggles externally. To be fair, the Zone in Roadside Picnic, the novel Stalker adapts, is also more overtly supernatural, but still in a very different way.
I really don't think it's fair to consider Stalker or Roadside Picnic anything more than inspiration for Annihilation.
* https://en.wikipedia.org/wiki/Annihilation_(VanderMeer_novel...
The questions about the realness of the Zone and the motives of the characters, allowed for much deeper and broader implications.
Annihilation was more specific and overlapped too much with explicit pre-existing myth(s), to be a remake of Stalker.