Thanks for the response Andrew.
This is unfortunate, and also a bit of a strange development (and IMHO a bit of an error with regards to how the dev team designed it)
So you’ve essentially left me with 3 choices:
1 - Leave the chat on and get totally spammed by messages from completely random people.
2 - Switching to obscure channels and I guess keep switching when that channel’s activity increases.
3 - Turn it all off and have no way of communicating with my guildmates.
None of these choices are as good as the old guild chat system, IMHO.
So, basically, this part of the patch actually broke a part of the game that was working well (or at least working better than it is now)