GObject's object model is insanely overcomplicated. It's more or less an implementation of C++ in C. It's overkill if you just want resizable arrays, hash tables, and maybe some trees.
I think gp confused gobject with glib. Glib has no object model, it’s a collection of functions and data structures, including “managed” strings. Just a better version of libc, if you don’t mind the size.
https://docs.gtk.org/glib/#structs