Don't Start Big, Start a Little Snowball
The problem with articles and discussions like this is that the "markers of success" pointed out may all be true, but incidental.Take Slack as an example. Yes, it was a simple idea with low product surface area and easily protypeable etc etc. But other people had built Slack-like products before that met the all those same criteria and were not successful. The critical factors for Slack were the connections the founders had (or made), the VC money, and perhaps a whole bunch of other things.As much as we'd like for there to be a nice, neat guides for successful businesses e.g. "build a little snowball", the truth is that the reasons for success are often totally unique, contradictory and unrepeatable.