There are a lot of different opinions about geometries, and this could get weird pretty quickly. I probably should have put a disclaimer on the post "all other things being equal, I find an 80's MTB geometry to be a little less comfortable ... " I used one for a commuter for a couple of years.

Let's turn the question on its head: "what good thing comes from having the bottom bracket higher?" Ground clearance comes to mind, but not a lot else.
For me, a lower BB means I can reach the ground without having to totally leave the saddle. It isn't much, but it is a little thing and I like it. The weight's a little lower when I'm moving, and that helps a little too. No doubt others will have different thoughts.