I think that would be the wrong direction. Basically you wish for a pocket size all in one desktop computer that can do tasks powered by a small tiny battery instead of a wall socket connection.
I think the still in development desktop mode for Android (Samsung shows what is possible) is the best solution for 99.9% of all smartphone users, who still rely on a desktop solely to do simple word processing and such things.
It's also the best option for vision impaired people or elderly people. I am close to 50 and just the normal decline of the near sight ability makes you begin to hate smart phones with their tiny screens.
I would love to have a desktop mode to use the smartphone like a "PC" without having to worry about extra hardware.
But I don't need (like most people won't) virtual machines with Linux, Windows and God knows what, I don't want to play the latest high-res video game halfway running on a 2000$ computer and so on.
Less distractions and superior data security is more than enough and the developers of GrapheneOS do a wonderful job coming to this.
And data security should be a human right. It's a wrong approach to aim at super powerful devices that will cost a fortune at the moment. To run several VM you will need a flagship phone with top hardware specs.
I think we should not forget all those people with low income, for those even a 500€ Pixel is too expensive.
We should focus on a daily driver phone that is secure, let's you do decent pictures and phone calls/video chats and has a working browser plus optional Google Apps. And that should cost a lot less than a Pixel, because otherwise it's hard to talk an OEM into production.
The numbers are on the table, a small portion of all Pixel owners uses Graphene. The Pixel is a upper mid price to highest price (depending on the model) smartphone that had better market penetration when Google sold these at more affordable prices.
If security shall become mainstream, it needs a device that is below or max 300$. That is the world biggest market, Pixel and iPhone and all the other flagships are mainly sold in Europe and USA, maybe some rich oil countries too.
Samsung isn't that big because of their galaxy line up, they sell a ton more of their cheaper devices.