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I have to agree with you. I have developed on Xoops, Joomla and Drupal and I have to say that any version of XOOPS beats Joomla and Drupal for debugging and error handling. Actually in the version of Joomla I use, I actually implemented and better debugging system and error handling.
I also added loads more with Zarilia like group debugging and a whole load of other things to help. Right now I am adding a better error handling system for my XOOPS work horse.