The previous issue was closed and it seems nothing has changed. If you don't intend to participate in good faith and provide an updated perspective, there's no reason to keep this issue open. Closing.

Experience has told us that we can't support all the existing customizations of the CSV format. There are too many. Supporting them all would produce a package that is difficult to use and test.

The code for encoding/csv.Writer is all of 182 lines, including comments. If you need a non-standard format, I encourage you to copy the code and modify it for your purposes.