Agreed. The RUM conjecture is more about the trade-off you get when trying to optimize read and write performance + space overhead of a datastructure. Big-O is about asymptotic complexity and can be applied to the RUM overheads. You can express them in Big-O as well, as I am doing in the second post.
I think it's not so much about the actual way to measure the overheads rather than understanding the trade-off that is formulated in the conjecture.
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