One interesting chart in this post is how much slower btrfs is compared to ext4! Missed hearing about that somehow.
The data here is very interesting. Sequential access is always faster even with DRAM (burst reads, prefetch), but the interesting question is whether it’s faster by a large enough margin to offset other design decisions. That’s a much more subtle question than the binary yes/no thing, and the article gives a lot of data towards it.
Always love to see Excalidraw sketches.