All kinds of data - block justified text, database files with fixed row size tables, even HTTP chunked encoding tends to have blocks of same size with same deli

All kinds of data - block justified text, database files with fixed row size tables, even HTTP chunked encoding tends to have blocks of same size with same delimiters,... I really don't see how better supporting this "second order repetition" feature in the encoding would cause such a big problem. LZ variants already track repeating strings.