This is a great great point. The higher the derivative of the learning curve, the higher the adoption rate. It's as if the product sweeps into the population an

This is a great great point. The higher the derivative of the learning curve, the higher the adoption rate. It's as if the product sweeps into the population and the magnitude of the derivative acts as a friction or an accelerant. It could also be noted that beyond this piece of the puzzle is also the incentive structure that surrounds the entire network, like an invisible fluid that you only notice when you take a step back. If demand is high and the market is ready for the idea, it'll flow as easily as through water. But if no demand is there to push it like a carrot in front of a horse, then the learning rate won't matter one iota, because the incentive structure is as dense as jello. Decentralized social networks are an example where this is the case. They're easy enough to learn, but without a demand for it, it won't propogate.