I just don't think it matters, which is why we don't specifically highlight it on our site, and I'm OK with that. We also don't mention the HTML5 export has a ~245kb overhead, which is a 1200% overhead if your game is 20kb, because it doesn't materially affect anything. Sure, someone could claim they want to run their game over a 56k modem and that overhead is too much, but for such a significant majority of users, it is of no practical importance, so it does not warrant a mention. Since virtually nobody else has ever complained about the NW.js file size overhead, I also believe it to be of no practical importance to the vast majority of users.
Exporting to the web is a viable alternative with little overhead if your game is not for sale. If your game is for sale, e.g. on Steam, then customers in that market are accustomed to multi-gigabyte downloads so a 65mb download does not seem like a significant hurdle to commercial success. If the game is not directly for sale (e.g. a free hobby-made indie game), then web publishing seems to be a perfectly viable low-overhead alternative.