Here's why:
* Focus on Prescriptive Rules: Traditional grammar emphasizes prescriptive rules, which are guidelines for how language *should* be used, rather than how it's actually spoken. These rules are often based on Latin grammar, which is a written language.
* Emphasis on Form: Traditional grammar focuses on the form of words and sentences, like verb tenses, parts of speech, and punctuation. These elements are more readily observed in written language.
* Limited Scope of Spoken Language: Traditional grammar doesn't adequately address the complexities of spoken language, which is often less formal and uses contractions, colloquialisms, and other features not typically found in written English.
While traditional grammar can be helpful for understanding the structure of language, it's important to recognize that spoken English is often more dynamic and nuanced than written English.