Why is Google averse to larger batteries? The Chinese makers have been stuffing 8000ish mah batteries in rather diminutive phones for two or three years now, and Google is releasing one in 2026 with about half that.
Because those are a different kind of battery, silicon-carbon and they wear out much quicker. I am sure they will eventually though.
Might be longevity concerns. Those new batteries are impressive, but the concern is that they will degrade a lot.
Also, remember the exploding Samsung phone. Experiments with batteries are risky for those companies.
Shipping regulations. >20Wh can't go by airpost in the west.