This has been discussed at Pi Towers.
Fundamentally, it is no different from the previous situation - just because raspi-config launched and had "Expand filesystem" as an option, there was nothing to indicate to a new user that expanding the f/s was something they actually needed to do. raspi-config did very little hand-holding, but just presented a long list of things you could try doing, which wasn't ideal from a UX point of view. I don't see that much is lost by not forcing the user into raspi-config, and I'd expect most new users to find "Raspberry Pi Configuration" in the desktop menus before too long and to see what it does.
At some point, I'd like to have a proper first-boot wizard that runs the first time the GUI opens in an image, which would deal with expanding the f/s - either that or automatically expanding the f/s on first boot. But there are only so many hours in the day, so it's on the to-do list for now!