I suppose. But as a software developer I've never created an Excel spreadsheet that wasn't first a CSV. I do most of my own work with local data files in jq for JSON or q for CSV, then go from a CSV to an Excel spreadsheet only when it's time to communicate that data with non-programmers.
Their niche is clearly supposed to be in helping developers and data scientists make that same leap, from the tools and formats native to their data pipelines to feature-rich spreadsheets as an export/reporting/analysis format for consumption by people who otherwise don't code. CS V support (especially for huge files) is unusually important there.
Their niche is clearly supposed to be in helping developers and data scientists make that same leap, from the tools and formats native to their data pipelines to feature-rich spreadsheets as an export/reporting/analysis format for consumption by people who otherwise don't code. CS V support (especially for huge files) is unusually important there.