I didn't know Sony had an "Open Devices" program, so thanks for bringing it to my attention. Apart from the price of their phones, I think that makes Sony a strong competitor to Google for people who value privacy over security and want a really good phone (spec-wise) that can flash a custom ROM out of the box.
This is wrong. The OP is wrong, and you provided a partial explanation with additional wrong information.
GrapheneOS has minimum device criteria, and currently only Pixel devices meet that. All the other commentary is nonsense.
Or do you mean Sony's latest device releases? The open firmware program is only for the midrange devices like the Xperia 10 and XA series before that, and of course it depends on having a maintainer. And new devices take time.
Jolla has both free and paid Sailfish OS license for some Sony open devices phones - https://shop.jolla.com/ ...
Its the only smart phone that can guarantee the radio is off when you put it in airplane mode.
The PinePhone can't?