The open button on Bl.ocks I was referring to opens another weg page that contains only the visualization. That web page allows me to very easily inspect elements – which is super important IMO to new learners. Right now, I don’t find such functionality on Observable. Inspecting elements is impossibly hard.
I totally agree. I was just describing things that are missing – reading, inspecting a vis as a whole, like what bl.ocks provided.