Comment by themanmaran

I think TAM is a relevant metric here.

Most people think of TAM as "how big could this be". But an equally important side is "how many people might be willing to buy this". Because that measures how easy sales will be.

Big ideas have larger TAM and therefore it's a little bit easier to land that first sale. Even with a very early stage product. With a large TAM you can pretty much throw infinite darts at the board and maybe on will land.

If you target too specific of a market (.dwg => .pdf converter for civil engineers). You'll have an easier time finding your market, but fewer chances to land the sale.