In addition to the points listed in the article, I think one of the most important differences between the two types of Advisors is that RoboAdvisors are required to put their clients' interests ahead of their own. Not so for Traditional Advisors. 
The Traditional Advisors' investment recommendations are only required to meet a lowly, Suitability Standard.
RoboAdvisors must be licensed as a Portfolio Manager and thus their advice adhere to the highest regulatory standard - a Fiduciary Standard. They are required to place their clients's interest ahead of their own.

Not so for Traditional Advisors.