Need I remind you that to build a wonder, you need to still get the tech in a timely matter, which will make Industrious dicey at high levels, especially as production is lost in civ4 if the wonder isn't completed.
Also, you need to actually finish a wonder for the (Ind)trait to be of any use at all, where as some other traits - even if less powerfull - will work for you nomatter what happens.
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