You state why 3 argument
open is preferable in the general case, where the file name is inpredictible, but IMO none of that applies here. I think 2 argument open is perfectly fine here. In fact, it makes more sense to use, than the 3 argument
open.
As for his choice in filehandle... *shrug* It works. Granted, as he wants to use a very localized filehandle, I think use of a my $fhandle (not our!) is warranted.
Anyway, I do think Perl::Critic is out of line.
p.s. Did you know the P5P refuse to fix the magical open for <>, it uses 2 argument open internally, so all your considerations apply there? Ask diotalevi about it some time, he can really get pissed off about it. Rightfully so, IMO.
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