Isn't Dustin contradicting himself? “The only reason you should be an entrepreneur is because that’s the only way the idea will come into the world,” Vs "A l

Isn't Dustin contradicting himself? “The only reason you should be an entrepreneur is because that’s the only way the idea will come into the world,” Vs "A lot of great people are wasting their time and talent by pursuing 'something that doesn’t exist yet,' instead of joining bigger projects that already have proven ideas." So, isn't YC trying to achieve precisely the latter: getting talented people into a proven entrepreneur's business?