I think the biggest thing they could do to make their products last longer is replaceable batteries. My iPhone 6S Plus was given a new life when I replaced its

I think the biggest thing they could do to make their products last longer is replaceable batteries. My iPhone 6S Plus was given a new life when I replaced its battery. I did this officially, but only because there was a massive discount (£100 -> £30). Newer iPhones battery replacements cost even more especially outside warranty.