Simply having GOS on your phone is meaningless if you don't know how to use it properly.

Removing spyware from the phone of a complete non-techie means that non-technie has a spyware-free phone.

Sure, it won't solve every privacy or security concern, but it outright solves a fuck-ton of privacy and security concerns, regardless of how technical the user is.

I've been handing GrapheneOS phones to young or elderly people in my life for several years, with very good results, compared to leaving them on iOS or stock malwared Android.