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I think these are all very legitimate reasons, thanks for the info!

Perhaps the better question is, how is this better than Google Spreadsheets? Most of your reasons still apply, but I believe google docs handles large spreadsheets pretty well (after an initial loading phase).

Google Sheets isn't open sourced and MIT licensed is one big difference

"It works on any tabular data source."

Just on that point, Excel allows you to define the field delimiter on import of text files and handles a ton of different formats out of the box, so I doubt this is a point where Tad is better than Excel (though Tad does look promising as a tool to quickly check data files).