But they have the "smaller safe" problem. This is where people don't want to read through the whole thread, so they skip to the end and post and write, "I bet t

But they have the "smaller safe" problem. This is where people don't want to read through the whole thread, so they skip to the end and post and write, "I bet there's a smaller safe inside!" So readers have to skim past dozens of those to get to the content. With threaded comments, it's more ephemeral, but the cream floats to the top, and the smaller safes sink to the bottom.