Unless I'm missing something, this is a container for the web app versions of the chat services listed. It's not a unified chat client, nor is it a UI layer on top of the clients.
You could achieve the same thing by opening a new browser window and then populating its tabs with each chat service... right?
I guess so.
Yes it is. But I like that it is focused on only displaying my chat tabs.
Plus I can easily cmd+tab to it without the need to switch to a specific window of my browser.