Just don't spend years making something before you know someone wants it? Over-optimizing for future scaling is also bad, YAGNI, etc... Pivots are a thing, if

Just don't spend years making something before you know someone wants it? Over-optimizing for future scaling is also bad, YAGNI, etc... Pivots are a thing, if the product ain't working can you tweak it/change it to be something else?