I think it’s more likely that your lawyers are stupid than YC is wrong about anything related to startups. Ideas are worth nothing. The technical founder could talk to 30 people in your industry and come to the same if not better conclusion for how the problems should be solved. Majority of the work will be building product. Should be equal split always
Should be equal split. Most of the work will be technical. 23% is absolutely an insult, you shouldn’t take anything less than 50%