So, the first tutorial on the list that you recommend has this page for functions[0]. It's more or less the same as GP's link.

YOU are the one misinforming, it would seem. Granted, I don't work with perl (5, never tried 6) for about 15 years, but most criticism of it seems to align with my experiences back then.

[0] http://mvp.kablamo.org/basics/functions/

Edit: The second [1] also recomends the @_ method, and the third [2] the shift method. Did you even read your own links?

[1] https://perlmaven.com/subroutines-and-functions-in-perl [2] https://learnxinyminutes.com/docs/perl/ (search for subroutines)