Change element-wise superposition to element-wise Juxtaposition?

[sehilyi]

If we decide not to include nesting based on the survey result, we have to decide whether to pretend element-wise superposition as element-wise juxtaposition for the flexibility because some might say that element-wise juxtaposition is somewhat confusing since it is actually 'overlaying' (parts of) two charts.

Is summary,

{layout: {type: juxtaposition, unit: element}} === {layout: {type: superposition, unit: element}} ?