Finally! I have been wanting them to remove that for a long time now.

Twitters biggest problem is that they are a protocol router more than a destination. And so while people use it to find content they consume this content somewhere else out of reach for twitters add engine.

Now that people will start writing on twitter this will mean a lot more time is spent on twitter consuming content on twitter and reading ads on twitter.

With this they get to keep the protocol part while keeping users longer on their platform to consume content.