Wasn't a big issue with Graphene that it doesn't support any form of smart battery charging?
And before the responses pour in, yes, I've read https://akc3n.page/posts/battery-management/. And no, there is not a quoted source for a device skipping maintenance mode at 80%, or to refute the many studies showing the benefit to lithium cells, or to cover wireless or non-PD charging. When a "solution" is using a smart plug with HA to stop charging, it's still an issue.
Edit: I do like GrapheneOS. This is just a decision I don't agree with.