Duplicate instead of Save As is a real PITA

Maybe I am not alone, but I think that the change of the natural (and years lasting) command Save As to highly annoying process of Duplicate is one of the most unfortunate and uncomfortable thing that happened to the iWorks. It never stops messing (and I already messed and lost so many documents due to that). Sometimes I forget that I have to do this Duplicate first , do some changes, do Duplicate later but the changes I did are saved in the original document without being asked if I want to change the original (!!!) (that to my shock I always find later). I think it was SO BAD idea to create this instead of simple Save As. And I may stop using iWorks etc. just because of that - since it is so annoying and does not make any sense and does not bring any advantage in my opinion.