Going to Linux and Graphene would be a huge inconvenience to me. A waste of time to manage and that’s not something I take lightly.
Discussion
Linux is easier to install and manage than MS Windows. Has been for years.
GrapheneOS, with your own self-hosted Nextcloud online ecosystem is a pain to set-up. You have to set every app and syncronize across all your devices, but after it's all setup, it's not so bad.