whether this is considered good Perl coding practice?

It's bad practice and generally shows a lack of maturity in the developer which is why it seems to be pretty common. Though, as CountZero said, it depends.

The sniff test is something like-

• Is the code all config? Something like a DBIx::Class::Result schema file is basically pure configuration which changes infrequently, if ever, so it should be code because moving it to config would gain nothing and would complicate its use.
• Does the config make it hard to change, repurpose, deploy, or edit code? Then it should be in config files.

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