One reason I think the advice in this post is valuable is not just to test the startup idea, but also to test the founder's appetite for traffic acquisition.
Many technical founders like building products, but those products will fail without the majority of energy directed toward getting traffic. So if you can't get a couple hundred email addresses of interested customers, you can save yourself a lot of time by not going further.
Many technical founders like building products, but those products will fail without the majority of energy directed toward getting traffic. So if you can't get a couple hundred email addresses of interested customers, you can save yourself a lot of time by not going further.