From https://photographylife.com/dng-vs-raw

> DNG strips out most of the unrecognized meta data (such as Active D-Lighting, Picture Controls, Focus Point, etc) from RAW files, making it impossible to retrieve this data from DNG in the future.

The last time I used a DSLR was when I was doing color research in 2012. At the time, raw format was the only thing that preserved all necessary information to make scientific observations.

Most people don't need to care about such things. I just wanted to mention you're irretrievably throwing away metadata when you DNG-dong your pictures.

It's probably a worthwhile trade in most cases though.