If the idea doesn't scale it could be a problem, especially if your revenue model is based on scaling or if you're planning on raising money.
I think the sentiment you're referring to is mostly "my idea scales but my prototype doesn't - I can't ship before my prototype scales!" and commenters saying don't let that stop you. That's definitely a mental hurdle to get over but a much more fixable problem.
I think the sentiment you're referring to is mostly "my idea scales but my prototype doesn't - I can't ship before my prototype scales!" and commenters saying don't let that stop you. That's definitely a mental hurdle to get over but a much more fixable problem.