We’re 15 years into the smartphone revolution now. I think people have enough wall plugs and cables by now.
Android manufacturers are just switching to USB-C from microUSB. So, no, nobody has 15 years of USB-C cables lying around.
I don't have a million USB-C cables, but I have a bunch. That is with me having just one USB device I use regularly (wireless headphone I got for cheap from amazon). I was shocked when digging through my drawer and pulling out three of those cables when I had exactly zero USB C devices. I am willing to bet I am the exception, not the norm though.
Android manufactures are just switching to USB C. And the budget phones are still sold with USB B
A few manufactures already do not include ear buds. I don't see the issue with not including the brick and earbuds. I don't use them anyway and it is just waste.
And that's a problem because?
Android (especially budget phones) are still sold with USB B. So they will switch to USB C and not bundle a charger with the box and market it as some environmental gain (which it is).