I think this is the key line: “The number-one lesson is just be very focused on what you need to do”. My sense is that WhatsApp spends all of its energy on the

I think this is the key line: “The number-one lesson is just be very focused on what you need to do”. My sense is that WhatsApp spends all of its energy on the very core product offering and not a bunch of superfluous activities. I don't think the language choice has much to do with it unless there's some sort of "keep it simple" thinking that the languages somehow exude.