If you know the problem you're solving and how to solve it well (i.e. product-market fit), then you shouldn't waste your time on a hack MVP. Build something awesome.

Unfortunately, the majority of work for a startup is about finding product-market fit. A la Steve Blank, a new product rarely survives first contact with customers. As such, spending too much time on something that will inevitably be changed doesn't make much sense.

Also, some people who are testing out ideas are probably just exploring, playing with the idea in their own head. It helps to send something out to friends simply to generate conversation and get quick feedback.

Don't hate.