I agree broadly. Libgen, anna's archive and archive.org are lifesavers for money and speed of transmission. But I also concur with the bookbros who think paper is better than digital. Especially with retention, or documents you want to keep in emergency lights out scenarios. The issue is that computer screens and readers are too distracting and not good for retention.
I've done ereaders as well, like you have. The issue with those is typical models phone home. I know there are hacks to get around this but I'm not sophisticated enough to do it. Also issues with not being able to rapidly flip to desired pages for review, but that's a minor thing.
Eink technology has world changing potential however. They are working on eink monitors for computer screens. That's what I want. The going rate was several thousand last I checked on amazon