Good point, though I don't see why you can't do both.
Very early on, of course the single most important thing is talking to users. You may not even have a website at that point. But once you're past that -- even at the point of getting dozens of somewhat target users per day -- why not leverage the site to convert while you sleep or while you do more one-on-one outreach?
Sure, you should have both. But I think the myth of "convert while you sleep" is dangerous. Your site should be just a communication support, exactly the same function of your business card. It must make you look professional and trustable. But only that (at the very beginning).
Only after you know, from personal experience and buying customers, what specifically make you sell more, then you go on thinking about leverage your website.
Very early on, of course the single most important thing is talking to users. You may not even have a website at that point. But once you're past that -- even at the point of getting dozens of somewhat target users per day -- why not leverage the site to convert while you sleep or while you do more one-on-one outreach?