A funeral is not always necessary.
Regarding the question of whether to have a funeral when there are no close relatives or friends that you feel like entertaining! I am an only child with few if any relatives that care a d*mn. My mother lived with us as an invalid for about 15 years. I was so shattered when she died I could not face a funeral. My husband agreed . My mother was buried in the local Woodland Burial ground and the lovely people there saw to everything . I felt she was not actually there but more with me or in a better place. l should have had a cremation but couldn't think straight at the time. We feel the funeral business is a con. but its not the money its having to go along with convention. A service some time afterwards can be held. Funerals are not about the person who has died! They are for those who are left. Just convention.