These questions are fine and all but they're not the ones to ask if you want to validate your idea. If you want validation you ask other people what they think

These questions are fine and all but they're not the ones to ask if you want to validate your idea. If you want validation you ask other people what they think of the idea, is it useful, would they pay, if they have the problem you're trying to solve. Asking yourself these questions will only get you twisting your answers to be "correct". Point is, it doesn't matter what you think, it matters what your market thinks. Extra points if you can identify that market.