While that is true yes, their whole brand is built on being secure.

If they release to Fairphone it won't be long before the news is flooded with "Police easily bypass supposedly secure GraphoneOS"

And that's not a look they'd want.

I like their stance on All or Nothing.

Motorola is shipping with GraphineOS soon.

all android devices have been using file based disk encryption since several Android versions now.

All Android devices are supposed to support it, but not all do. (or at least, not all do effectively without compromising the cryptographic root of trust by not implementing proper hardware security chips)

I'll grant it to you on the scopes, PIN changes, etc, but realistically I just don't think anyone can justify GrapheneOS being something that should be supported on Fairphone given how absolutely desolate the phone looks with regard to any attempt at all to hardware security.

It really depends on what security level you want out of a phone

It does, but that's exactly my point. GrapheneOS will provide you essentially no more security than any other alternative Android operating system, should it have to operate on a Fairphone with all those features not supported by a Fairphone stripped away.

Unless Fairphone adds more hardware security features that are standard on most other phones, and highly supported on Pixels, installing a heavily crippled GrapheneOS on a Fairphone would get you essentially none of the benefits of GrapheneOS in the first place.

Well sans duress password being a good idea now, when you get to the border, you can either unlock it or they'll just confiscate it. You don't get to be on their list and go through with a phone because they can't manage to decrypt it.