Engineers like maths, they are more than capable to use financial equations.
Not being invested in the whole Grasshopper fiasco, I have no opinion on how they run their company. However...I am always astounded as how little merit is given to administrative positions.
Engineers do like math, this does not translate to them understanding how retail accounting, or any accounting really, functions. Can they muddle through? Sure, and it will take them twice as long and 10 times the effort as someone trained. They can organize a supply chain but not as well as someone trained in doing so or who has years of experience doing so.
Furthermore, having spent a lot of time around people with master's and doctorates - obtaining higher degrees, sometimes coincides with a loss of common sense. When your mind is in the clouds, you very often fumble when walking because you miss the roots and rocks in your path. Many engineers are geniouses, who need an assistant to keep them organized and on time.
It is frustrating to me, with 20+ years of administrative experience (accounting, office management, project coordination, customer service) when people do not seem to realize that, much like engineering, administrative functions require a combination of skill, intuitive know-how, training, and experience. While it is not as complicated, it is a skill nonetheless. If you spent all your life studying engineering, when did you have time to study complex accounting, supply chain management, resource management, human resources, customer service, etc?
Do not discount how difficult it can be to administer all the functions of a business when you lack the proper skills, aptitude, interest, and training to actually perform all said functions.
I am not saying this to defend anyone. In fact, it irritates me to no end when businesses are poorly organized. That signals to me that the owners devalue the importance of organizational systems and the people who manage those systems and would, therefore, probably suck as employers because they only value ideas, not the methods of executing the idea, and sustaining the business once the idea is implemented.
My 2 cents on that. Contact the IRS and ask how many companies have gone under because they misunderstood tax laws, or weren't even aware of them, or at least who had such poor file systems they could not find the evidence to support claims they made, and then tell me that organizational management and back office tasks have no merit.