This is a very good list. Adrian's blog is, particularly, a treasure.
I wrote this post a while ago, aiming to answer a similar question about finding paper: http://brooker.co.za/blog/2020/05/25/reading.html One key point there is that there are, in my mind, multiple 'modes' of reading, and I like to use different approaches to finding material for different modes. Those blogs you list are great for curiosity mode. Another great resource there is Twitter: following distributed systems practitioners and researchers, and seeing what they tweet about. When I read a (recent) paper I really like, I often see if the authors are active on Twitter and follow them there if they are.
It's also important not to weight too much on recency. A lot of the canon is actually more approachable than newer papers. For example, Lamport's classic "Time, Clocks" (https://www.microsoft.com/en-us/research/publication/time-cl...) and distributed snapshot (https://www.microsoft.com/en-us/research/publication/distrib...) papers, and Gilbert and Lynch's CAP paper (http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.67....) are approachable without deep background or systems knowledge. Similarly, John Little's "
A Proof for the Queuing Formula: L = λW" (https://pubsonline.informs.org/doi/abs/10.1287/opre.9.3.383) is quite approachable if you have a math background but no systems knowledge, and is one of the foundational results behind the practice of building stable systems.
I've got some longer-form dives into researcher's work here: http://brooker.co.za/blog/2014/03/30/lamport-pub.html http://brooker.co.za/blog/2014/09/21/liskov-pub.html
http://brooker.co.za/blog/2014/05/10/lynch-pub.html
Finally, books. There are a couple recommendations for Martin Kleppman's Designing Data-Intensive Applications book, which I like a whole lot. Alex Petrov's "Database Internals" is also a very approachable introduction. I wish every practitioner in the field would read Harchol-Balter's Performance Modeling and Design of Computer Systems.