3. Why we say TBLT is different from traditional teaching approaches?

TBLT is essentially a   learner-centered and experiential pedagogical approach, which stands in contrast to more traditional approaches to language pedagogy.

TBLT appears to clash with received wisdom that suggests that the teacher should remain in charge of what happens in the classroom. (East, 2021)

Reference: 

East, M. (2021). Foundational principles of task-based language teaching (p. 214). Taylor & Francis.