Really? I tried GrapheneOS on a Pixel 4A, and without exaggerating or trying to come off sensationalist the experience was really tepid compared to iOS, and even "normal" Android. Stuttering and jerky UI (which often also wanted to take a brief nap), very poor GPU hardware acceleration support, notably worse battery life, loads of things that just didn't work well (or at all) without Gapps, and trying to get Play Services shoe-horned into GrapheneOS was still quite the bug-ridden hassle. Additionally, the Open Camera app produced rubbish results compared to Google's native Android camera app, which matters a lot to me.