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It is plain to see that Level-of-detail expressions are a very valuable tool to include in your development arsenal, that said though, as with all features with Tableau, developers need to consider whether their use is justified in the view they are currently building.
Its It is clear from the demonstrations above that alternatives do exist, and where possible, these alternatives should be explored, especially when connecting Tableau to large datasets in excess of 1 million rows, and that
How, where and why to use here.
Include multiple / daisy-chained expressions, re-iterate here by example how they are affected by filters, explain that they can be used inside table calcs but table calcs cannot be used inside lod expressions, explain why. Add a limitations subsection. Add a best practice sectionas the impact of these overly costly querie will greatly impact time-to-render, and may also impact other resources.
I would also suggest you take time to assess the calculations you are building and see if possible whether the LOD expression can be re-written and included in the underlying set.