Facebook: 7-8 replies at once. (Fewer for long posts, images, etc.) Instagram: 10+ LinkedIn: 8 Reddit: 10-15 Slashdot: 6+ StackOverflow: 6+ replies at once, unless they're actual code or longer answers Twitter: 8 Youtube: 11+
To be fair, none of those are forums of our style. The best comparison to most of those is the comments section of an article, blog, or news story. Of course we can rip out the post headers, functional buttons, etc, and make ourselves look just like any of them, but that doesn't serve much purpose other than to cram as much information into a vertical space as possible.
What I've done instead is shrunk as much space out of the post blocks as possible without creating usability issues.
Also worth mentioning that very little was changed with the forum layout so far. Mostly colors and fixing some basic styles. It takes more vertical space because it's not full width, but to really address the vertical spacing issue we have to create a completely new design, which was not on the table for this milestone.
This newer theme also seems to include duplicate lines for paragraph breaks, or perhaps the editor isn't merging consecutive lines any more.
The editor settings were changed so the input reflects the exact output. Enter is new paragraph (new <p></p> pair). Shift+enter is a line break (new <br>). This was not the case before, and it led to messy text. It'll be less of an issue here once all the caches get the updated JS. Meanwhile, I edit people's posts as I see it and have even run DB queries to replace the offending HTML.