I think this could also be stated as:

If no one is doing what you're doing, it's probably not because no one thought of it before. There are two reasons an idea might never have been developed into a product before:

1.) Seems too hard 2.) Seems unwanted

Underlying these perceptions might well be the reality that the idea is too hard, unwanted, or both, but the perception is what matters.

So, if you're doing something new, most people will think it's either too hard, unwanted, or both. (Otherwise, lots of people would be doing it.) They might be right, but their opinions are not meaningful data points.

If you want to innovate, don't waste your time arguing.