It really baffles me that people here don't realize that co-founders should be multi-disciplinary, so all should be able to do some kind of (!) business and/or tech part at least. A clear separation of skills would be a red flag for me that this team operates in an outdated mode. It's not 1990 anymore. If you're the business guy but don't value enough or even hate the tech work, I wouldn't believe in the company.