Value can mean a lot of different things to a lot of different people. Value by definition is subjective in the sense that the importance, worth, or usefulness of something depends on who is using it and what they're trying to achieve.

That said, one interesting way to measure value is how many cumulative man hours are saved with a particular technology.

Let's imagine you had an app that 1 million people use everyday to achieve a certain outcome. Let's also assume they each need to spend 15 minutes using the app to reach their outcome.

That equates to a cost on humanity of 250,000 human hours. If you can reduce the time spent in the app from 15 minutes to 14 minutes you've given back 16,666 hours of value to those people.

The point is, sometimes even the smallest improvement has a massive impact.