Consider this framework: Generally, user wants something new.
For example, you have your own developed delicacy and you called that a masterpiece. Then and now you taste it, you make another, another and another. And then there is a time you've been fed up eating that. Apparently, you've made it to a point of developing it. Add flavours, spices, colors, and alike. That is a simple maintenance, then there must be an innovation.