The OP was asking for disadvantages of Perl, and I was giving him a common view.
An easy thing is only complicated to achieve, which violates a mantra of Perl.
In fact this criticism is so widespread that Larry already changed this design in Perl 6 (almost a decade ago): @ and % default to references and the comma operator is changed.
IMHO that will (sadly) also be the biggest source of confusion for migrating to Perl6.
To be clear: I like flattened list, just shouldn't be the default.
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