On a 14" MBP the new version has 6 posts visible on initial load while the old version has 22 posts, a -73% reduction in information density. Not ideal.

It looks like the vote buttons were moved to the right to so that there would not be both vote buttons and post type icons on the left side of the post title. I would argue that vote buttons are more important and should get priority. Maybe remove the post type icons and instead add tags to post title? Then you can put the vote buttons back on the left side where they belong. If you do decide to keep the post type icons, there is way too much white space inside of the circles.

I don't understand why there is a "#" in front of the usernames. Hashtags are typically used to indicate topics rather than people. Unless this is sort of callback to IRC days where operators in front of names indicate server hierarchy.

If you are going to do all-white background I would like option to switch to dark mode.

I do like the timestamps though.