Not sure, listening to the wrong people maybe?
What exactly is their beef with glass tanks? What do they say is wrong with drilled tanks?
Are you saying these folks advocate external HOB overflows?
I don't know why they got funk with glass tanks. I met this guy at a LFS he asked me what I had I told him glass and he went crazy. Told me that they break, crack, leak, and the silicone dose not last long. O and you can't polishe them. And I'm asking what is a drilled tank? I read on a post here.