First, use 5.010; is not "a global-scope enablement"; it's just as lexically-scoped as use feature qw( say ); (except for the version check, obviously).
$ perl -e'
> { use 5.010; say "foo"; }
> say "bar";
> '
String found where operator expected at -e line 3, near "say "bar""
(Do you need to predeclare say?)
syntax error at -e line 3, near "say "bar""
Execution of -e aborted due to compilation errors.
Secondly, the need for say to be enabled has nothing to do with a need for "clean namespaces"; it's all about not breaking existing programs that have a sub named say.
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