Actual paid tasks / public use of your creation is definitely a good measure. It shows gaps as other people lean on it and put the weight of their own usage and

Actual paid tasks / public use of your creation is definitely a good measure. It shows gaps as other people lean on it and put the weight of their own usage and expectations into play. Its the difference between making a tool for yourself versus sharing it with others. They will see it differently. Hopefully you'll receive enough constructive criticism that will improve the tool and your process as well. Followup thought: We can make things alone but are always surrounded by and connected to the greater community. This is not the same as teamwork. Private victory proceeds public victory.