I don't intend to use Export to CSV regularly, but in case I ever should need it I tested it.
As for Import, I haven't used yet but it has possibilities for feeding in quantities of items quickly.
But - different countries have different conventions for the decimal separator. Those I have encountered are full-stop and comma.
Here (in Sweden) the comma is the decimal separator and appears in decimal values in Excel spreadsheets.
Obviously using comma in CSV files would be a disaster here. A colon is a good alternative.
In fact, saving Excel sheets to CSV files here uses the colon as default (not even sure I can change it)
Please can we have the option to choose the separator ourselves when Exporting and Importing.