I just saw Raf0's suggestion about the advertisements and they started mentioning the chat spam.
I had an idea, a golden one but I am not sure if its even possible to implement.
I'm sure most of you guys have probably played WoW because the idea comes from there.
The chat panel there looks like this:
What if we had the exact same thing, but for:
All + Local chat + CC
Party chat + PMs
The idea is to make the chat more clean and good looking, while still being efficient. We could maybe switch the tabs with altgr and the mouse. Let me know if its possible on the first place and if you like it!