I'd invite you all to read this, as this idea has been pretty fleshed out on the main legion forums:
https://www.501st.com/forum/viewtopic.php?f=129&t=115884More specifically, the part that says: "per the OPS protocol, a garrison must have a working website and forum."
Basically, ALL legion business must be handled on a forum (it doesn't specify that this must be that forum), but there is nothing stopping a garrison from having a Discord for non-legion related business, such as recruiting, private sales (not merch), carpooling, etc. The issue is that a Discord server is not owned by the legion and can be shut down at some point with everything in it being lost, whereas we own the forum and it has quite the history of this garrison.
So, do what you want with other tech, but sign-ups and events are to stay on this forum unless we create another forum, which also would have a substantial cost attached, I assume.
Now, if you want to replace the hundreds of Facebook messenger chats with another form of communication to coordinate carpools, etc, please feel free. But, you won't get 100% participation, just like now. Personally, I'm good without Discord and don't see that I'd want another form of messages on my phone.