If you put a block around a file-scope lexical, it is not a file-scope lexical anymore. Writing the main code after subs are defined is another "just be careful" convention — it works (until the convention is broken), but if you do not accept conventions as legitimate solutions to problems with bareword filehandles, then why do you accept conventions as solutions to problems with lexicals?
The last issue of programmer ignorance is not a problem that can be solved by changing the language, only by educating the programmers about the language in which they write.
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