For most of my use cases, I also need 4) can easily interact with Excel. A lot of things 'around here' run off spreadsheets, because relational databases were

For most of my use cases, I also need 4) can easily interact with Excel. A lot of things 'around here' run off spreadsheets, because relational databases weren't invented here and no-one ever needs more than a few million rows apparently. I seem to spend half my job on the current project exporting stuff to CSV, running it through my code, then opening the resulting CSV in excel and formatting it a bit and saving as .xlsx again. Still, at least I don't have to use Visual Basic that way.