I can agree that you absolutely can navigate without fast travel, but the whole design seems to be guiding you towards just fast traveling. From the menus always offering a “show on map” option, which then pulls up the prominent “land” prompt, to the fact that even fast traveling you’re apt to hit 4 loading screens completely killing any sense of continuity, and that only gets worse if you try to actually navigate.
It feels like a big series of set pieces broken up by a ton of liminal either loading screens or menus, depending on your preference of poison. I’ve never felt like I was discovering cool things, just going to the next set piece.