I have family still using the 2017 Macbook Airs, happily. A year ago I replaced the battery on two of them (from OWC which still offers high quality ones). Every year I ask them if they want to upgrade to a new model Macbook and they refuse. Meanwhile I have other family on Chromebooks that they've had to replace twice already because they are too slow, or the hinges on the screen have worn out, or the charging port got too annoyingly loose.