[Quoth]

The T1 also had a dictionary bug and offered nothing significant over the prior models in usability. I have a PRS350 and I had the PRS-T1.
The PRS350 and T1 do allow embedded publisher fonts and unlike the horride Kindle DX, the stock fonts are OK. Most people never add fonts to an ereader. User fonts and User Font menus are nothing to do with Linux vs Android, but a developer choice.

I've developed for Linux and Android. The only advantage for Android is Apps. I have an Android eink which does take apps, but for epub reading, finding books (Library features) OR annotation it's seriously poorer than the Kindle PW3, Original Kobo H2O, Kobo Libra and for library/collections and epub reading, poorer than the PSR350, allowing for the 7.8" vs 5" screens. The major advantage of the Android is being able to run the Android reading apps for DRM content, inc the Belinda Borrowbox of our County Library and incidently the 7.8" screen and PDFs. But the 7.8" screen and the PDF reader application doesn't need Android.
I do have email (real email, not the Android Mail which gives all the settings to Google), browser, text editor + BT Keyboard and a decent Android Music/Audio book player. But I don't use any of that, too inferior to the phone and/or tablet.
Android ONLY exists on top of Linux to allow Android version of Java style apps, originally so the devs could migrate easily from the crippled version of java on Symbian.
So Android is totally pointless without the PlayStore. But most apps are poor on eInk. Also the stock GUI of Android is ghastly, it's also STILL unfinished and chops & changes File access to SD card per release. The Google Material Design GUI appearance guideline are idiotic. Google has wilfully ignored GUI principles and privacy on the erratic development of Android since they bought it in.