In Hong Kong, Should Expats Learn Cantonese?

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Christopher DeWolf, In Hong Kong, Should Expats Learn Cantonese?  China Real Time, Mar 18, 2015
blogs.wsj.com/expat/2015/03/18/in-hong-kong-should-expats-learn-cantonese/
("(Cantonese has either six or nine tones, depending on whom you ask – just one reason why it’s such a difficult language to learn.) * * * 'It’s a damned difficult language,' she [McLane] says. Cantonese is structurally difficult, with simple yet tricky grammar and more tones than almost any other language. (In Asia, only Vietnamese comes close, with six tones.)")

Note:
(a) "Daisann McLane * * * runs a bespoke tour company called Little Adventures in Hong Kong"

Little Adventures in Hong Kong  香港食行小旅行
www.littleadventuresinhongkong.com/
(b) "Sometimes I earn plaudits for saying even basic words like ng goi 唔該 (thank you/excuse me)."