Why would you need all data to build the frontpage? Why not just make a sliding window with the content from the last 24/48h?
Exactly what I’m saying. To not be super resource-intensive, client-side sorting needs to be incomplete. As I said, if there is hypothetical post from 49 hours ago with 10k upvotes, you will not see it, but you will see one from 48 hours ago with 1k upvotes.
Even if that were true, how is that different, e.g, from any modern desktop email client?
Not much I guess(sounds like Thunderbird). But what about mobile?