All the friggin' shaders we have to run to waste GPU cycles, just to get those blobs pretending to refract light. Don't even get me started about the ever-increasing border radii!?
The GPU compute used by this is trivial for modern SoCs.
There is so much power and efficiency in a modern iPhone processor that these simple shaders are entirely negligible.
Phones aren’t a good place to try to save aggregate energy use at a population level. They already use vanishingly small amounts of energy compared to just about anything in your house.
Betas aren't meant for use on your main phone where you want reliability and battery life.
Apple has 1bio devices out there, if each of them consumes 10% more energy due to this change, that's a massive energy consumption increase - and this change offers no functional benefit at all.
The idea that this change would consume 10% more energy seems completely unrealistic too.