So the lesson is that every single developer should rewrite all of their complicated code (the code which uses closures and circular referencing) so that the major browser developers can avoid writing a good GC algorithm?

It reminded me of this story from the Jargon File: http://www.catb.org/~esr/jargon/html/koans.html#id3141202

So we should believe that browser developers are no more advanced than students from the 70s?

Browser JavaScript implementations use refcounting instead of proper garbage collection? If so, why?