It's all float value arrays with metadata in the end. Most camera sensors are pretty similar and follow common patterns.

DNGs have added benefits, like including compression (optional) (either lossy or lossless) and error correction bytes to prevent corruption (optional). Even if there's some concerns like unique features or performance, I'd still rather use DNGs without these features and with reduced performance.

I always archive my RAWs as lossy compressed DNGs with error correction and without thumbnails to save space and some added "safety".