missing-root I've heard a lot of people say this (and yes, I've read akc3n's article in full many times) but I haven't seen any proof.
Much research has been done (already linked) showing that a charge level of around 4.05V/cell provides extreme benefits to total battery life (not just cycles but total lifetime).
I'd like to at least see some data showing that this is the maximum charge given to e.g. Pixel phones at 100% based on the actual phone or a reliable app reporting as such. In my experience the charge at 100% is 4.2v or higher.
If someone can show that Pixels are limited to 4.05v then I'd be impressed.
I think a feature that would shut off a phone at 25% would be worth adding as well.