Can you elaborate on that? A significant portion of DNA in organisms literally encodes for protein sequences. It also has functional parts (binding sites for proteins, promoter sequences). Some RNAs are not translated because the RNA itself has function, but I don't see that same argument for DNA.
And like 90% of E. coli genome is protein coding. I intentionally wasn't limiting it to humans because humans make up a very small portion of total DNA in the world.