not entirely correct. since iphone 7/8, they started having 3 or more new SKU per year. more importantly, now they treat older models as the lower segment SKU

not entirely correct. since iphone 7/8, they started having 3 or more new SKU per year. more importantly, now they treat older models as the lower segment SKU that they continue selling for many years to come. not to forget the even older SKUs that resellers offer in developing countries that come from somewhere. so realistically they got 8-10 SKU actively sold in their own stores, before you consider special "red" editions etc. to me this is not much different from the developing countries getting some budget SKU from the likes of Samsung and even Nokia in their heyday.