It is a truism that accommodating to others' speech may prove beneficial or detrimental, in the long run. For example, immigrants whose command of standard English or any other language is not "up to scratch" is bound to suffer discrimination and prejudice on the part of teachers and society at large, which puts paid to their educational and career prospects. Moreover, adapting our speech patterns (pronunciation, speech rate, content etc.) to those of our interlocutors can exert a tremendous influence on our career prospects and prestige, or even affect the judicial outcome of a trial. At any rate,
...accommodation is to be seen as a multiply-organized and contextually complex set of alternatives, regularly available to communicators in face-to-face talk. It can function to index and achieve solidarity with or dissociation from a conversational partner, reciprocally and dynamically (Giles & Coupland, 1991: 60-61).