Felt same way about GrapheneOS but a few friends set it up so i gave it a try. It is easy to install and use. As evidence, I gave my 70 year old father one and he loves it.
However he's been on it now for months and every time he shows me something on it I get a little more jealous. Everything seems to be working fine, including e.g. bank apps, and he has interesting features like some kind of app zoning thing limiting permissions on a zone to zone basis.
The only problem is it's only available on massive phones without headphone jacks and SD card slots, so I'm sticking with Xperia for now.