Ha. This is so dumb. People can already easily link a Medium page / github gist / whatever. The reason people write threads is that people don't like to click links that get them out of the Twitter flow. Many reasons for this, but basically it's friction and Twitter is very flaky with keeping your position within the timeline (at least on Android).

Keeping it in app should be a step forward, but a clickable "read more" that expand *within the timeline* (same way it works for threads within the timeline, though unfortunately not within list) is the only thing that will kill threads.