I don't know how mamey-sapotes do with salt spray. [In Belize some sapodillas grow in the sea.]
In Yucatán, mamey-sapotes withstand prolonged dry seasons annually, on shallow clay soils over limestone rocks, with the water table probably well over 50 feet down in most places. I don't know what the air humidity levels run there. We were not discussing desert plants.
Recently we have had several drought years here in south Florida, with little rain from November thru June. My sandy yard is 27 feet above the water table. I don't have an irrigation system, and sporadically water plants that look stressed. Many plants and trees have died in my yard, but all the ones I listed (except for mamey-sapote and carissa, which I observed elswhere) are doing just fine, some with no rain or irrigation for two months.
I did not list soursop, which has needed frequent extra waterings. I also did not list Rollinia deliciosa (mucosa) which do not survive for me unless grafted on drought- hardy rootsock. Sugar-apples just barely hold on.