hisisbecausethesetheories(1)failtoincorporateadevelopmentalperspective;(2)failto|considerthedevelopmentofcommunicative competenceexplicitly.inrelationtospecificcontexts,inparticularthéschoolcontext;and(3)failtoexaminethedevelopmentalrelationshipsbetweenL}andL2.
This sounds like a really big oversight on part of the theories and research done in communicative competence. No developmental perspective (students might have LDs or they might be developmentally ahead) can skew data. Not considering contexts can skew data (students who have access to different things). And certainly as we know so far from the textbook the cross-lingual relationship between L1 and L2 is probably the most pivotal thing to consider. Again, this really sounds like an oversight! And imagine, there's been generations of teachers who have been taught with that research.
Ghassane