No root nor command line interface use required. A simple step by step button click process is available which avoids any risk pf hard bricking a device. With people like myself on hand to help hand hold if needed.

grapheneos.org/install/web

I run grapheneos and the installation was soo easy that I installed it trough my old phone while waiting for the bus. For the other options I agree but I still think a web installer could be made