Interesting points! Starting from a narrow perspective gives you feedback that is valuable, not noise that you can ignore. Most founders set their sights on an audience that is overfit (too narrow) or underfit (they have no experience). Striking a balance is key.
Consulting is one thing, but in the startup ecosystem I'm in I have (during the last 15 years) never ever seen a startup having a too narrow target segment (and I know several investors with the same mindset).
