The map design in Elden Ring is of the same quality as their level design in Souls. The issue with ER is that the Souls formula simply doesn't land itself to this kind of format. It's not that ER is done badly, it's that what it wanted to do cannot be done as a matter of principle.
Very true. What seems to have been lost in the modern era is that the allure of open world games is not in having a big field to jump around but for the player to be able to experience the game world as a whole. To put it into Souls terms the point is to not be boxed into a singular Boletarian castle but to be able to experience all or at least most of Boletaria.
This is why I to this day maintain that Gothic 1-2 are the platinum standard of open world design because in both you experience the story both through the main narrative and the world itself. Those games give you the sense that not only did you finish the main quest and slain the dragon but that you have also "lived" for a moment on Khorinis and cared about its fate.
Based on that I judge Elden Ring's open world as "perfectly adequate" but mostly pointless. From software does literary nothing with all those big open plains, mines and dungeons besides sequestering bigger and minor bosses into them. They could have easily cut about 50% of the landmass without losing much of any actual value. All the areas are essentially hyper abstracted battle arenas with basically no inhabitants or even inhabitable structures. The few NPCs that you do talk to, talk very little and usually not what you would care to know and their quests are basically a collection of "guess where I will spawn next". Ironically this much bigger and more detailed world feels so much more fake than anything from DeS or DS because there I could buy that I am exploring just a small section of a castle that just so happens to not be the living space but when I move into a whole open world then I have a hard time accepting that there are like 5 beds in the world total.
Do you know why so many people picked Ranni's ending? Because she is pretty much the only NPC in the game that actually feels "human" as in she has more than 1-5 lines of looping dialog and has some connections to the world around her besides the fact that she spawn in the world space.
ER's world is the definition of a missed opportunity and the only reason why it gets so much praise really is because a decade of absolutely gutter trash open worlds from Ubisoft has lowered the bar so much that anything slightly better than shit gets to be called a master piece.