Went through Hospice with my B-I-L who had Cancer as well as my Mother and Aunt who both died of Organ Failure.
Hospice makes the Patient comfortable and pain free. They do nothing to “speed up” the Patient’s demise, they just don’t provide Life Extending treatment.
If the Doctor’s see no path for your Father’s recovery, Hospice Care is the right thing to do. They are trained to deal with the situation. I’m not sure what your Moral and Ethical issues are. It is all about the Patient being Pain free and receiving dignified end of Life care.
As an aside, my Father who was also 93 passed away the end of October. He had a Heart Attack after getting emergency Abdominal Surgery. Up until the last week of his Life he was perfectly fine. He survived 60 Years of Alcoholism, achieving Sobriety at age 79 and he survived Lymphoma at age 82. Full Remission after just one round of Chemo.
I figured he would make it to 100, but 93 wasn’t a bad run.
Prayers for you Father and the rest of your Family.
By definition the demise of the patient is speeded up. Dehydrating and starving a patient will definitely hasten the time of the person's passing.