In a nutshell, for commercial purposes, is it still ok to only speak English?
In my experience of multinational work the project language is always English.
I think sales is different in that you need every advantage possible and customers are going to prefer buying from a guy in their home town rather than some foreigner with an accent... of course if you are competing on price this may be different.
As far as chinese goes it may well be very important in the future - but practically how doable is it to learn? I believe, and I may be wrong, that it's easier for a japanese, korean, thai, etc person to learn english than chinese.
Maybe you can hire a chinese nanny for your kids in the future but for average blokes like me being fluent to business level in chinese isn't going to happen unless I put a huge effort in which would be better spent elsewhere.
As far as easy to learn and immediate practical use english is the sweet spot.
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