They refuse since over a decade to implement some generic way to open the file-picker native to the running DE. They force their garbage usability on everybody, even people that would prefer not to use "anything Gnome". Same issue with CSDs, by the way.
Like I said: They can have their broken stuff at their place if they prefer it like that. But it's utterly antisocial to force that stuff on everybody without any opt-out possibility. They even actively and deliberately break and remove configuration options. That's just not OK.