Trump speaks Hindi in ad to get Indian-American votes

Click HERE
This has a parallel in Singapore politics, where politicians who can speak a minority's language often has an edge in reaching out to that group and winning thier support. Applies also for dialect... case in point, Low Thia Khiang speaks Teochew? (or is it Hokkien?) fluently...PM Lee speaks  Malay.

Qn: Is there any value in learning a minorty language?