I think Dorsey is too minimalistic. It was the reason why Twitter is losing traffic to IG and Medium (ironic). Vine lost to IG video because you couldn't follow Vine accounts via the Twitter website at the beginning. Take Square for example, it had a huge head start, but no business other than small coffee shops and food trucks can use it. https://medium.com/@hungrycharles/3-things-twitter-can-do-to...
Also their app was one of the worse I had the displeasure of using on a mobile phone. Really.
Instagram did the concept much, much better.