No, official GrapheneOS is an ideal method to control data. As a part of this, they also provide build documentation for whatever you want to do. It is FOSS, after all.

To be clear, I am NOT advising root access. I am not contradicting myself. I am telling you it is dangerous but still telling you how it can be done in a less terrible way. To withhold that info would be senseless gatekeeping. GrapheneOS supports being built as a userdebug image but that will not stop them from telling you how bad an idea it is to use it on a production device.

GrapheneOS will not be rolling back aspects of the security model. That would be a massive step backwards for privacy and security.