The problem with a friend chat tab is that communication with them is quite personal, and you have a separate conversation with each of them. Hence, you couldn’t necessarily have a tab for each conversation. Further, people might have quite a lot of friends. Perhaps easier would be something like a ‘feed,’ which displays the messages of your friends and etc. along with their names. I’m not sure if this is necessary, and the chat tabs tend to instead direct you to overall ‘rooms’ (eg. faction chat, world chat) where you can speak and so on.
The purple text isn’t necessarily that hard to read, however some people could have legitimate problems of that sort. The game should also probably introduce the chat area slightly during the earlier period, since otherwise you would often have to find the team chat – etc. – on your own. It might not be immediately obvious what they are for, and many newer members end up replying to team-up messages in other streams. This makes communication slightly more difficult than it needs to be, among other things. However, purple text does sort of complement the colour scheme of this game – with places like the Holy City, etc. I don’t mind the idea.