[__gcd]

To be fair if your benchmark is against demo day, at some point Amdahl's law kicks in regardless of how many multiples you have on engineering. Not sure if I believe the multiple of 10x or 100x anyway, but a better metric is “number of customer feedback loops” is a better metric than “can complete one (1) demo day in X time”. My (non YC) impression is that people are hitting more loops.

Also multiples “up” versus “down” are not symmetric. Airplanes are around 10x faster than cars, but that doesn’t mean I’ll be getting to work in 60 seconds.

[Jensson]

If you can't do something extremely impressive with the equivalent of hundreds worth of full time engineers then there is something wrong with you as a founder.

Note that real engineers helps you come up with new features and test your product and all that and not just add code, adding code was never a bottleneck on just about any problem ever.

So Amdahl's law applies in terms of the time to add code, not in terms of engineers, they don't do the work of 100 engineers, at best they take 100x less time to add lines of code when they know what they wanna make. But that isn't particularly game changing, as adding code is not the hard or even time consuming part.