I think the words You and I can be very decisive, depending on the situation, and should be avoided. Even if you adjust your tone, using You and I creates two separate groups, which distances you from your client's need. (Source: Justin Cutroni, Avoid I and You in Consulting)
I agree and would extend this beyond just consulting. In any type of relationship - whether business or personal - it would signify a tighter bond by using "we".
We are in this together.
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