What is the use of "Canonical Shape detection for non-canonic result" check mark in CATIA GSD sweep command?

Going through the document and after few iterations on CATIA, I came to know that "Canonical Shape Detection" option is useful if we want the resulting surface to be recognize as std. cylinder or sphere or planar for many operations like assembling, using as a sketch support, etc.... But for explicit profile the name of command is different. And DOC says that the result will be canonical, irrespective of input. Can somebody list down the benefits of canonical shapes or why not to use every time canonical shapes?

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Hey... finally someone who talks about it...
I finally came to a conclusion about it... I was designing sheet metal parts and I couldn't get a recognize without setting canonical shape detection up....
Yes then... It's confirmed...You're right.
AND THANKS FOR IT...

To answer your queston...
I worked on plastic parts once... Using canonical shape detection sometimes, I couldn't develope the sweep expecially on twisted areas.... It was like it was forced to keep every starting points of the guide curve...

 
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