FWIW it has a specific purpose in Unicode: compatibility.
"it should be possible to convert from x to Unicode and back and get the same result" is a design principle, for a large number of x. Adding SGML to the list at a cost of one code point is reasonable.
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[ 5.8 ms ] story [ 13.7 ms ] thread"it should be possible to convert from x to Unicode and back and get the same result" is a design principle, for a large number of x. Adding SGML to the list at a cost of one code point is reasonable.