Well, since pretty much everything that consumes power today has an MCU in it, simple MCUs are extremely cheap. Volumes are immense. They are also space efficient and it is easy to manufacture PCBAs with them. They also occupy that sweet spot where the need for low power consumption means that you use gate sizes that are fairly largeish -- manufacturing processes and technology that is much, much cheaper than what is used for CPUs for instance.
Same thing with batteries. Ridiculous volume -> low prices. (Laptops and cell phones is why we have usable electric cars. If the EV industry had to drive up the volume all on its own it would have taken much longer to develop that industry)
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Well, since pretty much everything that consumes power today has an MCU in it, simple MCUs are extremely cheap. Volumes are immense. They are also space efficient and it is easy to manufacture PCBAs with them. They also occupy that sweet spot where the need for low power consumption means that you use gate sizes that are fairly largeish -- manufacturing processes and technology that is much, much cheaper than what is used for CPUs for instance.
Same thing with batteries. Ridiculous volume -> low prices. (Laptops and cell phones is why we have usable electric cars. If the EV industry had to drive up the volume all on its own it would have taken much longer to develop that industry)