I'm comparing this to a similar situation I was in recently trying to advise a group to focus on one problem, not all the possibilities. That is the simple sta

I'm comparing this to a similar situation I was in recently trying to advise a group to focus on one problem, not all the possibilities. That is the simple statement, as you said '[how does this feature address] the problem we're trying to solve'? Sometimes adding too many features turns the 'product into a mess', but I would argue that is not always the case. It sounds to me like you have very little confidence in the co-founder to make the right decisions. That may be well justified, it may not be. Sorry I can't help any further.