[bluedino]

Your lack of communication can hurt others. One person being 'productive' while causing blocks for others isn't good for the team.

[JohnFen]

Why do you assume he's causing blocks?

I don't see what he said as lacking communication. It's enhancing it by allowing them to "schedule" it according to their workflow.

Very rarely does anything actually need an immediate response, and when it does, just call the person.