Keep in mind, the cost of waste of a product is not only the product itself, but also its packaging, marketing materials, etc.
Companies know they can make products that will become waste in a short period of time, which increases profitability because people will have to buy things more frequently. The cost of disposal gets pushed onto society, with companies taking little or no responsibility for it.
There is no reason why phones with current specs couldn't be supported for at least five years.
"You'll get two years of support if you're lucky" is just insane.
Designing to permit repair and end-of-life disassembly should be standard to permit, and perhaps mandate, end-of-life recycling until the average person consumes no plastic, despite using 20kg.
For comparison, one AirPod weighs 0.008 pounds (0.004 kg).