I think you are answering not quite what's being asked. I think it's completely reasonable to want to be able to get root on your device. For the exact reasons

I think you are answering not quite what's being asked. I think it's completely reasonable to want to be able to get root on your device. For the exact reasons you mentioned. GrapheneOS allows that. To actually do so, it's reasonable to have a reason. Otherwise what you're doing is basically running commands with sudo "because you can", which will bite you. To have a rooted phone just for the sake of the trophy of having a rooted phone is something generally considered worse. Better to have a rootable phone, which you root if or when you have need of it.