table dataViewMappings columns order and show items with no data dependency on chronological order

Demo DataModel

I am new comer here and trying to develop a customer visual (sort of Kanban board) , order of dragging fields into visual dictates resulting dataview irrespective of user reordering actions after first drag!! Am I missing something here or is it sort of missing capability? 

1. first field dragged is used to left join others, hence option "show items with no data" is not producing expected results if field of choice was dragged into visual later

2. neither metadata nor column order of appearance into dataview table reflects the order in which user chooses the columns to appear one after the other 

sample data in next diagram "features" are grouped by "stages" (one "stage" to many "feautres" relationship), if stage "label" field is dragged first, dataview table will contain row(s) of data for "stages" with no "features" , if "label" is added late, no rows for "stages" with no "features" are found in the dataview table. (sample reports and resulting dataviews are in next screenshots) 

 label dragged first dataviewlabel dragged late dataview

user fields reordering after drag, no metadata, no impact on dataview table