Much of this advice is already well-known to these founders, but they do it anyway. And why? A big part is motivation. To do a startup, you have to motivate you

Much of this advice is already well-known to these founders, but they do it anyway. And why? A big part is motivation. To do a startup, you have to motivate yourself and often part of this is falling in love with your product or your technology and dreaming big. So as an example some technical founders love figuring the scaling out and this motivates them to create a proper, clever product, even if it never reaches 10 users in the end. Without such motivation, no product.