But the user has no way at all of accessing or modifying your data fields unless you've defined an accessor method.
Not quite. You can still go "under the hood" from outside of the module:
my $person = new Person;
# No 'toes' method
print $person->name, " is ", $person->age, " years old.\n";
print "And has ", $person->("toes"), " toes\n";
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