Nice post Jason! Haven't seen you in a while, you used to frequent VLab planning meetings

You may want to add "Getting their point across" to the list too. Communication skill (and negotiation skill) is very important for tech co-founder role. Early on, the business co-founder may be the voice of all decisions made by the company. But, as the company grows, the tech co-founder will need to defend his decisions to board members and outsiders.