So instead of a quick conversation 30 minutes with helpful whiteboard doodles, I have to compose my questions and decision-tree into an e-mail and wait at least for a day or two for a reply that may or may not be useful.
They would email each other even though they were in the same office more to document everything and CYA than for communications.
On the dev side, I banned internal email for discussions. I told them that they must talk to people first if they are in the office and then send emails of documents, screen shots or whatever.
I also took it on as personal mission to never say "no" to any request and always talk to the person who was making the request - in person - see if we could come up with an acceptable compromise and tell them how it would affect their deliverable.
Later that remote person left the company, and the position was left unfilled for a year and some projects got mothballed.