I've noticed a few places where removing the ice sheets leads to falling through the planet. But that is a very small problem compared to the useless graphic details that are removed.

@DOSIDOS ... yes, because it globally removed the ice sheets. You can still jump up out of the water to the door, though. (I tested this). "Adding it back" means adding the objects back globally, then individually deleting objects through-out the entire game... which would take forever.

My suggestion is to disable the mod while performing the "hermaeus mora" quest, then re-enabling it after you're done. (Since a lot of that quest has to do with hunting down blood from the various species, you can enable/disable the mod as you see fit).

it removes the ice path on the way to septimus signus cave please add it back

@Tigra I agree to some extent, but a) not everyone can throw money at a problem, thus can't upgrade to a better solution, and b) removing simple objects zero's out their poly's instead of reducing them. Plus, there's no pop-in from using a lower object fade distance (the objects were never there, thus never fade in or out). There's also people like me that run a beefy computer, but like to remove details from the game in order to make it easier for more important things to stand out.

@Tigra The mod is made to help users with older/less powerful comps. Nobody can help their price range.

Not realy a good Idea to reduce Details, better would be to upgrade the PC or made the objects low poly so the look is the same but lower polycount, the textures will hide it, I think.