Techlore and Louis Rossman actively recommend against GrapheneOS, afaik purely for nontechnical reasons.
That is factually a bad thing for the users as GrapheneOS is by far the best free software and privacy friendly Android variant
The vague way this is always repeated doesnt help credibility though and the Person on the GrapheneOS side who is currently using the social media accounts is massively spreading FUD
Unlikely, different hardware with more independence will come. Pixels will likely be more secure than the first iteration of that phone. They are working with them to get basic security like a secure element going.