Why "?T" instead of "T?"?

[John Cowan]

With conditional types gone, is there any reason not to use
the clearer "T?" for a nullable type?  It's compatible with
C# and with the "T!" syntax.

-- 
All Gaul is divided into three parts: the part          John Cowan
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that cooks with olive oil, and the part that            cowan at ccil.org
cooks with butter. -- David Chessler