In the early days, that is actually okay. Unless you did a large marketing campaign (you shouldn't), the number of people who never come back because of your cr

In the early days, that is actually okay. Unless you did a large marketing campaign (you shouldn't), the number of people who never come back because of your crappy MVP will be small. And the group will likely be small enough where your product doesn't get a bad reputation either. But you absolutely need to get feedback from those users who never come back so that eventually the product gets better and gets traction. I think tools to collect that indirect feedback (e.g. click heatmaps) are more mature on web overall. Collecting direct feedback, talking to users, is equally hard regardless of web or mobile.