Or a third option - an economic success that economies of scale have made massively capable hardware the cheapest option for many applications, despite being overkill.
The materials that go into a chip are nothing. The process of making the chip is roughly the same no matter the power of it. So having one chip that can satisfy a large range of customers needs is so much better than wasting development time making a custom just good enough chip for each.
They really aren't. Every material that goes into every chip needs to be sourced from various mines around the world, shipped to factories to be assembled, then the end goods need to be shipped again around the world to be sold or directly dumped.
High power, low power, it all has negative environmental impact.
ultra pure water production itself is responsible for untold amounts of hydroflouric acid and ammonia , and most etching processes have an F-Gas involved, and most plants that do this work have tremendously high energy (power) costs due to stability needs/hvac.
Maybe. They have the potential for faster semiconductors, but only after adequate modifications. Graphene isn't a semiconductor, and it isn't obvious that we'll find a way to fix that without (or even with) rare resources.
It’s the opposite. Using an off the shelf MCU is much more efficient than trying to spin your own ASIC.
Doing the work in software allows for updates and bug fixes, which are more likely to prevent piles of hardware from going into the landfill (in some cases before they even reach customers’ hands).