I don't know about the word "visionary" or using it as some sort of self-descriptive label, but I do think it's important for the founders investing their time

I don't know about the word "visionary" or using it as some sort of self-descriptive label, but I do think it's important for the founders investing their time and effort into a startup to have a vision for what they're really trying to achieve and to dream big. That's obviously not sufficient for success, but I suspect that to some extent it is necessary, given the commitment that tends to be needed from founders and perhaps early employees and how difficult it can be to ride out the rough patches without some sort of goal you believe will be worth it in the end.