Any written medium is a bad forum for discussion because it completely lacks the wide emotional bandwidth. If the topic is in any way subtle, risky, controversial, etc. you will get more conflict, misunderstanding, etc. in writing than in person, and fallout will be much harder to get away from. That has been the experience of me and many managers I worked with in IT over the years. I would be shocked if you could get anywhere near the results of in-person conversations with written comms. That should only be possible if you are incredibly aligned with everyone in your org (how likely is that?) or you aren't really discussing anything openly (feigned discussions).