That's because their are statistical entities. The only entities in our universe are dynamic structures that form into relatively stable structures are the result of a dynamic collection bits of information at a finer grain. This problem is intuitively understandable. For example, the hypothesized superstrings which make up particles, such as electrons, quarks, photons, and neutrinos, are estimated to be smaller than 10 -33 cm. Superstrings, if they exist, and lets assume they do in some form, contain a great deal of information.
Superstrings are large compared to a single bit.
Therefore, it is very understandable why we cannot directly detect that the universe is digital.