Basically a startup idea is just a solution to a problems that is being faced by common people in their day to day life or else you can say a better way to approach a particular problem. They can also be extremely complex still addressing issues important to solve.
The initial idea can be complex but you need to analyze that how realistic is the idea. You can take reviews from different people about your idea and you might get encouragement and confidence to take up that idea forward and actuate it.
How complex your startup idea be but when you are pitching it to potential investors or to your friend for a advice, you should be able to make them clear about your idea.
Your idea needs to have a Unique selling point, a unique feature to attract buyers. For example the idea of zomato was to provide your favorite food from your favorite restaurant at your doorstep. Here the idea was simple but executing this idea must be really complex. So complex startup idea just require focus and thinking in right direction to actuate the idea and make profit out of it.
Doing proper brainstroming with proper set of people which will improve the likelihood of success and waste less tie down the road.
