Hi Karim! Glad you enjoyed the post.
I stumbled upon the RUM paper and I also didn't hear about it before. I think the conjecture is more a conceptual model. However it helped me to look at different data structures and their design from a different angle. The fact that you can "optimize" the design for the different overheads makes trade-offs more visible.
Also the paper contains a lot of references to other papers that I added to my reading list, triggering the blog post series.
Regarding the request for a post about concurrent data structures, I added it to my todo list :)
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