Answer:
Because of Origin and Original Meaning
Step-by-step explanation:
Since those words don't exist originally in the actual language which adopted them, from there you can say it's much better to use the regionalism and meaning of the ORIGIN of the language to explain it in a more profound and in a more accurate way by using it by its etymological basis.
Examples:
°Their PARETION is gross. (PAREZZA: cursing language)
°BUDDHISM is one of the religions of the Hindu nationality in India.
and the second reason is that, the one word borrowed word that it retains its meaning. (Buddha's religion)
°I want to eat BURRITOS.(Large Tacos)