And the grammar is probably a lot less obvious. The classroom experience teaches most of us to look for things like adfixes (prefixes and suffixes) and "parts of speech" and call that "grammar", but grammar is much more than that. In a language like English, for instance, stress, intonation, elision, contraction and "white space" all have grammatical significance (with rules for use that evolve over time, have dialectical variations, and are almost never taught directly). Squiggles on paper (usually) don't capture much of that.