Issue: Regression: section borders

I'm not sure what you refer to. Not much about the section HTML has changed in VaultWiki 4, but the CSS classes have been renamed so they are all more consistent.

section titles are .vw-head
section content is .vw-section

I see, this explains a lot. Only part of the xenforo style properties are used by VW. It would be nice if there would be more integration in this regard so that its not needed to replicate the forum style in VW. For example section borders should have the same style variable as vbulletins table border and xenforo's style property building blocks -> section border.

I think this is a biggie because not everyone is comfortable with complex styling systems and without proper style property mapping VW can look really bad.

Please take a look at the main wiki article on my live website. Or any other wiki article on my live website.
Each section has a border around it and is spaced. This makes it easier to read sections and visually see the distinction.

Oh I see. You are referring to the H=1 section which behaved differently by creating a new block. The same thing happens in XenForo, but it inherits its CSS from the main wiki block, which does not have a border in XenForo.

This is fixed in the next release. Secondary H=1 sections now also receive the 'section' class (which again, doesn't have a border in default XenForo). To make up for it, a divider element has been added, which is styled by default (in vBulletin, it is not). You can put an ad block here too if you want. You can see here how it looks: https://www.vaultwiki.org/xf/demo/Bad-Tag-Nesting