Almost no addons communicate in channels blizzard is restricting. as others said, like 99% of addons are fine with party, raid, guild, whisper.
The real concern is addon authors for the addons they are intenting to break with this are ALREADY talking about just buildinga mesh network over whisper syncs, which means blizzard will get mad and break that next, and that will break a few addons then. The authors in question don’t care about the spirit of game and would rather watch blizzard gut everything.
On another note, It’s nice to see SAY coming back. I may be able to put the SAY message back on kazzak Mark out in the world. But we’ll see.
With say/yell change in classic, will you guys (blizzard) bring that to retail as well?