LTT did a video on GrapheneOS recently[0]. The conclusion was basically that it’s a trade off between privacy and convenience. It will require more tinkering and things that don’t “just work”. While I haven’t used GrapheneOS, it doesn’t seem like something a non-technical user would have the patience for, unless they were into the idea of picking up a new hobby of managing their phone’s OS.

[0] https://m.youtube.com/watch?v=gDR6V5OdnYg