I think your edit is why I am excited about this feature. There are so many times when I just need some relatively simple text formatting, such as titlecase, but want to store the original text too. Titlecase isn't hard to do or expensive, but I only have to do it once with a simple SQL expression. Then client code can decide whether they SELECT the formatted or original text. This is especially helpful if I don't already have an ETL pipeline that includes a cleaning/formatting step, and I just need 1-2 columns to be formatted.