C-style three-clause for loops have been deemed unperlish, are deprecated, and have been removed from the core language in Perl6.

The C-style for loop hasn't been removed from perl6, it's just been renamed:

loop my $i = 0; $i < $n; $i++ { ... }
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And the C-style for loop has hardly been deemed "unperlish". If anything, it's unperlish for this particular purpose (iterating over an array index). It's certainly useful in other situations (though, in perl6, many of those situations are satisfied by other, newer language features)