Because it’s an official package with dedicated visibility in the documentation, not just any third-party package. Since official packages usually have their own documentation and a dedicated channel here, I thought it would be interesting to add one for this as well.
Whether there are many questions or just a few doesn’t really change the point, even if someone only has one question in the future, the channel would already be there.
@gfucci There are many first party packages—some much older than Pint—that don’t have dedicated channels: Cashier, Passport, etc. It doesn’t stop people creating questions about them.