when you’re thinking about your product, think about what it replaces, not just what it offers
What is someone going to stop doing when they start using your product?
Jason Fried

Fixating on this and figuring out its ‘effect’ — (understanding what users will be leaving behind in order to adopt our service) will take up a lot of our time that we invest in, before building our product — (our product could be the replication of other products with little or no identical characteristics). Yet, having a list of things that users ask for, are used to and don’t want to lose will keep the business up definitely!