Earlier quoted context omitted.
In my understanding, it's not the OS that makes it a toy but the hardware. I guess something with open schematics (Librem 5, Pinephone) should be better, or an open-hardware device like Precursor.
If the open hardware offers at least comparable security then maybe. If the hardware is an open book then no. A short list of the hardware security measures necessary to consider it "not a toy" ;) -- https://grapheneos.org/faq#future-devices
> If the hardware is an open book then no.
So you choose security through obscurity. I have no further questions.