I don't have a clue, but at least it's gone now (along with other out-dated versions of scripting languages).

The release notes for 10.15 (when it was first deprecated) do say:

Scripting language runtimes such as Python, Ruby, and Perl are included in macOS for compatibility with legacy software. Future versions of macOS won’t include scripting language runtimes by default

The same appears in the Xcode 11 release notes.

They don't say what specific "legacy software" they refer to though.