Funny you posted this SB. I just went up to a property I manage for a friend. About 6 - 7 years ago I planted a bunch of Liberty's for him in two different orchards. There is a bunch of wild trees for x pollination. The first one I did everything for him, the 2nd I did everything for him except wrap the bottom with window screen. I ran out. I told him to get some, but of course he didn't and now those trees that are still alive are struggling. The first orchard is beautiful.
The reason I posted this is because the first orchard that was planted with great care at the start and little else since is really nice. Lot's of apples already and they are very healthy. I think I sprayed them twice the first year to get them a good start and only pruned them twice. I don't know, everyone's situation is different , but I've planted, sold, and helped people with thousands of Liberty, Enterprise, Galarina and other disease resistant variety's and if they get the right care at the get go they almost always do well and are easy as heck to care for. Liberty imo are at the top of the list. I've got a few crabs I like too, but they get the same exact care as those disease resistant trees. No easier or harder to care for.
Besides planting (in a good setting, water, etc
), caging, wrapping bases and training properly at the start, the biggest factor for easy care, is planting disease resistant trees. That includes many crabs which are disease resistant.