Generally agree with this unless your team is going through an incubator/accelerator. Those programs (and not just YC/500) are best taken advantage of by a 3-4 person team.
Granted, I haven't been through an accelerator but I heard a great talk by Tim Falls of SendGrid who does have a lot of experience through TechStars and he covered this topic. To get full value out of an accelerator/incubator you need to be in a position to leverage the relationships you are making AND continue iterating and developing your product/business model. And two people isn't enough to do that. Love to hear your thoughts.
I see what he's saying. In terms of long term consideration though, would that early burst of ability and speed be worth some of the issues that might crop up later?