I strongly believe that constraints spark creativity and art.
Now that I'm browsing $webapp I realize that modern web is born from the rejection of the constraints implied by the original design: URL's are independent of state, navigation is overridden to oblivion, etc.
Now I truly appreciate hacks that show how you can slip between constraints, but it's not really that: we just removed the constraints entirely and now we wonder why we need an IDE, a transpiler and KB's of CSS to implement <center>.