Get AMOLED instead if you read academic papers. Eink is awful for academic papers due to a slower processor, slower screen and worse controls. AMOLED can have true blacks, and you can avoid eink completely once microLED comes out. This might be a good article for the philosophy of the larger eink reader, calling them blueprint readers.
https://the-digital-reader.com/2016/03/30/99721/
You want an AMOLED screen. With the moonreader app, I am able to get true blacks (darker than eink) with white or red font for night reading. This is a compromise as its a higher resolution screen but only 10.5in for something like the tab S5e but entirely worth it for the easy searches, faster and better choices of applications, ease for reading at night if refresh rates don't bother your eyes, and how much dimmer it can get, and can be adjusted on the fly with the moonreader app (I really like it but theres lots of other good ones too).