Isn't the whole point to have a lightweight system for viewing and basic manipulations of csv files, so that you could safely import them into more powerful systems that let you do complex transformations, visualizations,... ?
At this point why wouldn't I just go straight into one of the more powerful systems then? They all have sufficient viewing capabilities as well. The idea behind adding more utility functions to transform data is to make Modern CSV a nimble but capable CSV tool without the need for a more robust solution (like Power BI, Tableau, etc.)
Because csv import into Excel can be a bit of a nightmare if the data is formatted in a way not covered by the import wizards. I've written Python scripts before to format data so that Excel would parse it correctly (which tbf was mostly the fault of the party producing said files), I wouldn't have minded having a light-weight visual tool for that.