Example: https://old.reddit.com/r/GooglePixel/comments/ytk1ng/graphen...
Also Google Pay is missing.
I see just one minor tradeoff - no face unlock.
Graphene isn't made to cater to what everyone wants. Face ID and fingerprint unlocking so clearly have no place in a hardened OS. "Google OS-level integration is absent" should not be suprising.
This said, you ought to be able to have BFU security with stock Android and it's embarrassing Google ships stock vulnerable.
I know! My entire point is Graphene wouldn't be a good choice for the stock OS on a mass-market phone. The Graphene devices will be great, but if Google were to replace their stock OS with Graphene there would be problems.
If the general public prefers unsafe phones, they can chose literally any else brand. This is never going to be a mass market phone because of the tradeoffs that are perfectly fine for the intended recipients (eg people who believe a torch/calculator app REALLY doesn't need internet access, or that their Instagram REALLY doesn't need to have access to ALL the photos/videos.