This is all very true, but it's old news. When donepezil was introduced it was for medium stage Alzheimers only. Around the time OH was diagnosed, it became common to use it in early stages. Fortunately, OHs consultant firmly believed this was the way forward. Not all consultants did. Even I could see the stupidity of not giving a delaying drug to someone in early stages!
Not too long afterwards it was stated that donepezil was also of use in end stage as well. I can't remember exactly when, but we were still reading New Scientist, so I'm guessing at least 4 years ago. Sure enough, OH wasn't stopped from taking it until he was practically below the scale, 3 months before he died.