I used to do this all the time, but only now do I realise that someone has come up with something to describe it.

This can also be used to hack productivity - making a task seem larger than it actually is, and allowing more time to solve related technical debt by slowing down the rate of visible stakeholder deliverables, but giving just enough carrot to keep their attention. If you introduce the UI quickly but continuously ask for more time to solve the related back-end issues, the stakeholders quickly become frustrated.