Unfortunately yes. There aren't many hard and fast rules in the startup world, but I think the closest we've got is that it's always better to sacrifice value for better explainability.
If people can't understand it in a sentence then they aren't going to use it. And if you can get them using it then you can always add more functionality later.
Problems that are inherently too complicated to explain in a sentence or two aren't worth solving, at least not for startups. That's why we have government and non-profits.
That's not to say everyone needs to able to grok every implication right off the bat. For my own startup everyone can understand what I'm working on after a sentence, but no one can understand why it's a good idea without reading another three or four paragraphs. That's fine though, because it will be obvious once it's launched without having to read anything.