Yeah, but that enables you to declare another variable named `S` and it'll compile. The tag name space is still there, and still causes problems. The typedef approach ensures you won't have problems.

People have learned to deal with the quirky behavior of the tag name space, but it's still quirky and serves no purpose.

I wrote Bjarne back in the 1980s that the tag name space should be removed from `class` as that wasn't necessary for backwards compatibility with C. He replied no as it would have broken compatibility with existing C++ code.