[ducharmdev]

> How is being “leaky” in any way bad or even good?

Information-gathering is a common early step in any attack against a system; knowing the language & libraries involved (especially their versions) allows you to search for any existing CVEs that apply.

> Are you advocating “security by obscurity”?

I don't think OP was implying that security by obscurity alone is sufficient, just that it's unwise to advertise information that's not relevant to end users, that could help would-be attackers.