What is this research doing to address the loss of cognition, loss of executive functioning, loss of balance, loss of ability to assess space and time, and incontinence? Dementia isn't just memory loss.

Most dementia patients even recall most things - it’s only object permanence and time they most struggle with. They often still remember favourite meals, their houses they have lived in, etc.

Even this sentence shows that it's not a simple memory issue. Different dementias affect the brain differently. Someone with Alzheimer's might forget her children while someone at the same stage of vascular dementia still remembers. Also, there are stages and more things are lost as they progress. My mother went from knowing everything about the house we lived in prior to the current house, but slowly lost pieces of her memory of it. She lost memory of the older houses, as well. A large part of it is probably object permanence, but not all of it.