I have the same remark. In the studio I work at, we're still using version 6.4 (so on Windows). There you can easily see the difference between bold and regular S-slots.
When testing fusion 8 on my MacbookPro, I noticed the difference between the bold and regular S-slots is very very small.
I thought it was going to be a OSX-only issue, but it seems that the Windows version has the same issue? That's unfortunate. Hope they can fix this on the final release.