Earlier quoted context omitted.
I never understood why file open/save dialog is a separate thing. I want to use my file manager to open and save files!
You need a separate UI to handle things like entering the file name and filtering for appropriate files. Windows was designed so that the same file browser component is used in the Explorer and in open/save dialogs (but with Windows 7-era UI), but on Linux, which file manager should GTK use? GTK sometimes likes to pretend it’s separate from GNOME.
> GTK sometimes likes to pretend it’s separate from GNOME.
It is. I happily use a GTK desktop environment and it is not GNOME.