Because they didn't leave any option to "break everything". If the new stuff was mature when released it might be a different story.
Some people actually have work to do however and don't appreciate being forced from a 2.0 to a 0.5alpha without option. Unless you wanted to stay on an unsupported dist for years as I did with Natty (until recently).
Despite my complaints, experimentation is fine in my book... The best way of handling this would be to ship Gnome2 and 3/Unity side-by-side and let the user choose, but 2 was dumped immediately for something broken, unknown, and undocumented. There's no way to stay current without "busting" your desktop.
Some people actually have work to do however and don't appreciate being forced from a 2.0 to a 0.5alpha without option. Unless you wanted to stay on an unsupported dist for years as I did with Natty (until recently).
Despite my complaints, experimentation is fine in my book... The best way of handling this would be to ship Gnome2 and 3/Unity side-by-side and let the user choose, but 2 was dumped immediately for something broken, unknown, and undocumented. There's no way to stay current without "busting" your desktop.