An extremely bad-faith reply (calling my opinion and understanding wrong), but I will attempt to reply: His recommendation is to avoid complexity, because it will make it hard to scale later. I think complexity is fine, because 1. above + 2. if you're really worried about future scaling.
PEOPLE: can we not take everything so personally please? It's killing the country and some good HN threads.
<EDIT> And even if you were called "wrong," who cares? it probably just means that your argument "could be wrong" so it's not you. And if it's you, then consider it a great anonymous tip for life improvement! And if you prove that someone else's argument is wrong, then guess what: you just helped a fellow human!