The first time somebody invents something, there is no existing body of knowledge about it. Which means there is no way to be efficient, cut corners, learn from the mistakes of others.
So the first of anything — the first automobile, the first 3D printer, the first laser printer, the first machine to record music — is necessarily overbuilt. It is generally quite expensive, probably very heavy, may use exotic materials that are not easily sourced, and just all around impractical.
If you look at the first example of anything newly invented, you might think that it could never catch on. There are so many things about it that are impractical, that could not be mass produced, that might even be dangerous to consumers.
But the point is that it now exists. It’s not just a conjecture, it’s a reality. And people can start trying it out, taking it for a spin.
And if that invention turns out to do something that the world wants, lots of other folks will come along who will make it a lot cheaper and lighter, find a way to use more common materials, and get it ready for market.
So if you have an idea for invention, don’t try to make it market ready all in one go. Just build the damn thing.