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Hello - ETL can't be parameter to judge a visual tool's capability. May be I am a bit harsh on this. But while evaluating a visual tool we have considered following five parameters and compared capabilities among visual tools.
These days most of the tool can connect to any data / cloud / database, so I have ignored that point as well.
The ROI for project sponsors is "Rapid Implementations" of Self Service, visual, Map Based interactive dashboards.