I think a careful evaluation should be spent in finding the right balance between "General enough, so you can find users" (as advised in the article) and "if y

I think a careful evaluation should be spent in finding the right balance between "General enough, so you can find users" (as advised in the article) and "if you're a solo entrepreneur find a niche so you have less competition, expecially from big names" (paraphrasing Rob Walling, Tim Ferris and others)