It was kind of meta to click through each one to this same HN story. At least until Polymer, which displays an earlier first page. I suppose it should work that way, but it felt like I'd taken a wrong turn.
We've discussed standardizing the specifications [1] for each of the apps which covers how they're hosted, how they fetch their data, etc... That's something we still need to do so hopefully sometime soon we'll have each of the apps standardized similarly.
[1] https://github.com/tastejs/hacker-news-pwas/issues/7#issueco...