Just to mention, DNG has an option to store the original raw file. The files will be bigger but you can always restore the original file. It will be bit for bit identical.
By the way, TIFF is also a format specified by Adobe and DNG is just a TIFF variant. My remembrance tells me TIFF was developed by Aldus and taken over by Adobe.
I have all my files in the native RAW format with 100% of the data. I have some that have been processed and saved as TIFF files for print labs and some saved as JPEG for Web use. Why would I want to translate all my RAW files into a proprietary Adobe format that holds me hostage to this company that has shown for the past 20 years that it is power crazy, buying up competitors and killing their products again and again and again, and now forcing its customers to rent the software month to month.
I also lose all the camera manufacturer specific settings as with Nikon and it Active D Lighting. I have had problems with the Adobe Camera Raw converter, which is reverse engineered from the output file of the cameras, where I get banding or loss of dynamic range and other problems and I resolved them every time by opening the file using the Nikon RAW converter and then saving as a TIFF.
TIFF by the way is the only non-proprietary lossless file format that exists. I can send a TIFF to any lab or graphics or print shop anywhere in the world. The same is not true for a DNG file.