It very much depends on the community. In urban centres, door-to-door delivery is very important to many people. In rural communities, having service within the community somewhere is really important.
In a rural community, often many people will know who their neighbours are and they can get someone to pick up their mail for them, so it's not as important to have that door-to-door kind of delivery. However, transportation is a big issue for rural older adults, so anything that means people have to go outside of their immediate community is difficult.
In urban centres, it's much more difficult to have someone go and pick up your mail for you because you don't necessarily have family or close friends who are your immediate neighbours, and you don't necessarily know your neighbours that well.
I live in an apartment-style condo, and it's quite adequate that our mailboxes are on the main floor of the building, and we get our mail that way. That works very well for people.
It really depends on the size of the community and the situation.