Let’s not forget the residential solid wast removal technician’s (garbage man) contribution to improved health.
That one is more arguable. It's more important in cities than suburban or rural areas. I am more a fan of composting, presorted recycling, and more sophisticated packaging (which did a LOT to reduce food spoilage). In general, I like the idea of vehicles carrying goods both to and from the point of use.
As an example, our family of four rarely fills a 20 gallon garbage can, but I do take out a truckload of steel and other recyclables perhaps once a year. We don't go to great lengths, but do try to do the simple things. I treat disassembly as an engineering problem, looking at how things are made with respect to the product lifecycle. There is a lot of room for improvement, particularly as regards material selection. My guess is that if we really confronted these problems, we'd use a great many more farmed or compostable materials.