It's ridiculous is what it is. It makes me deeply distrustful of the organisation behind Graphene that they would make such a crazy choice.
What other phone would you pick?
I’m not an expert, but all the listed points there sound reasonable. If indeed only the Pixels support them, well, it’s too bad there’s not other, similarly secure hardware out there.
If you want Graphene level security you need to have the hardware for it.
Motorola has stepped up to meet the baseline requirements for GrapheneOS support, and we should get Motorola devices with official GrapheneOS support next year.