That's a lot of hardware for a $300 device. These phones generally won't be subsidized by app stores or carriers and even larger companies have trouble hitting that price point right now. I can see the appeal for SD card storage, but it's much slower and less reliable than emmc. E-ink isn't really ready for everyday phone usage, it's refresh rate just isn't fast enough. I have a color reader and it's great for reading, but you could never do anything like watch a video. I think software is way more important right now than bespoke hardware. What OS are you going to run on it? What GUI? Where are you going to get Linux apps made for a phone screen?

Biggest issue is that Qualcomm, Mediatek and anx others don't use mainline kernels. They all have their ancient forks with garbage code stapled on to run Android. That means you're either using that ancient code through a translation layer (Halium + libhybris, used in UB Touch, Droidian) or try and write drivers that can be merged upstream (postmarketOS).

RISC-V doesn't have any CPUs with similar performance to ARM, still work in progress and not guarantee the manufacturers will care any more about mainline Linux.

Fairphone 4 with PostmarketOS?

Sorry, I won't do less than 16G ram, 512GB storage. Those two are minima for me. Then I need good cameras front and back, good big non curved OLED display, and I want it to run linux so that I can finally get rid of all the google bullshit. I don't care if it costs me double that, I'll pay

I can’t use banking apps on postmarket os so I won’t try anything new even though I can keep my old phone as a spare and continue to use the apps for 3 extra years with a physical authenticator after official support is dropped for my model.

Whelp Linux aren’t perfect better go back to the duopoly 🤪