blackfin I think I will switch to GrapheneOS, but I think Samsung makes good hardware which I would prefer to use.
They do make pretty good tablet hardware. And their security updates are way better than what some other vendors provide.
I expect the GrapheneOS developers would like to support Samsung devices, given the appropriate ingredients (I suspect verified boot with a user-selected trust root would be a key ingredient).
Maybe if lots of existing Samsung customers would explain why they are reluctantly leaving... who knows?