To list a few more: - The switch from symfony 1.4 to Symfony 2.0 requires a complete rewrite. Support for symfony 1.4 stopped fairly quickly; there seemed no u

To list a few more: - The switch from symfony 1.4 to Symfony 2.0 requires a complete rewrite. Support for symfony 1.4 stopped fairly quickly; there seemed no understanding that companies wouldn't pay to rewrite their messy-but-working systems onto a 'cleaner' framework. - MODX Content Management System. There is no upgrade path from 1.X to 2.X. Good luck to you if you've invested years developing your site on 1.X...