The difficulty that a friend of mine had was that he had a Lasting POA but not a Welfare POA for his father. His father was just on the cusp of having capacity . His father's physical health deteriorated quite dramatically and he could no longer be looked after in my friend's home (he had been staying there for two years since the death of his wife, friend's mother). When asked if he would agree to go from hospital into a Nursing Home, he said No, he would prefer to go back to my friend's home. A bit of a tricky one .
Eventually, the Drs decided that he did not have Capacity and he was moved from hospital to a Nursing Home where he settled reasonably well for the short time he had left before he passed away.
Not entirely sure that having a Welfare POA would have helped in this case, but my friend did wish he had organised it when his father had had Capacity rather than getting it after. There was no doubt that father needed Nursing Home Care but it felt like he was 'putting him away' and I think other members of the family (all offering no help, of course) made him feel a bit bad.
but Barmaid's your woman for this problem.