[hjkl0]

> The tool may save the developer, let's say 3-4 hours / week

This is the main flaw in your argument. For any developer who will actually save 3-4 hours a week with this tool, there are a thousand developers who will only save 3-4 hours a year.

As a potential user, how do you know which group you’ll be on?

And as business, how do you make the decision to only target one in a thousand potential users?