My wife 6s+ is still being supported? She complains constantly about the device randomly turning off itself last year. I changed the battery for her and hoped t

My wife 6s+ is still being supported? She complains constantly about the device randomly turning off itself last year. I changed the battery for her and hoped that Apple would stop patching it so she could let it go. Man, comparing to the shitshow that Sample Galaxy devices are: 2-3 year of support max. I'm not sure if it is better now since I have stopped using anything Samsung manufactured after S5.