Greg Egan, Iain Banks and Sam Hughes are good stuff, if you haven’t.
Also, there’s this amazing new genre, “LitRpg”. Basically fantasy where an rpg type videogame became real.
Most of it is the usual dreck but some of it goes hard sf, delving into the existential stuff.
A couple of the rationalists have even taken a swing.
Try
Mother of Learning
Death after death
Friendship is optimal
So ya, real development is still alive.
No, modern sci-fi evolved over time like all the other complex stuff tends to.
Modern sci-fi is created by every fellow with a strange idea. Who thinks maybe I could get my idea across better if I framed it as a narrative and put it in scientific terms. because science is such a lovely language for talking about strange ideas.