I get where that quote is coming from. And there is some truth to it. But having no idea how big the market is doesn't necessarily imply that you timed things w

I get where that quote is coming from. And there is some truth to it. But having no idea how big the market is doesn't necessarily imply that you timed things well and have a great opportunity. Market sizing should be done to set rough upper and lower bounds on who might want to buy your product. If potentially all parents of toddlers might want your product then that's awesome. But if only parents of toddlers who also have a pet fox would be interested, well, it's probably a much smaller opportunity (unless, of course, you can make the case that foxes are about to become incredibly popular as pets).