PCs are far more secure/anon vs even graphene on a pixel.

Lol, both kind of devices have dedicated chips on the CPU that run their own microcode.

Drives aren’t very easily backed up or even cloned.

You can use Neobackup to periodically backup, or recovery create a clone of the system partition. If you mean external drives, you are right.

Software is limited on mobile or needing flashed or rooted.

Well… Depends on what you need to use. There’s very few apps or niche use cases that require root.

SSDs slots as USBs are just slower and finnicky fiddly.

Just use an SSD enclosure

Convenience when on the go without sacrificing processing power as least as possible.

Again, it depends on what you want to do. Open and edit documents? Phones are more than capable Edit videos? That’s gonna take a while.

What about a central PC setup that you carry everywhere? Having access to running VMs, servers, all on the go. Not a laptop but similar to an micro ITX or Intel NUC.

Something like a GPD?

Syncthing full allocation also offers conflict resolution 🤷‍♂️🤔

How is this any different from having syncthing application?

Unthinkable. He lives and breathes McDonald’s