We are attracting newcomers with no experience of Stack Exchange, and The Library is a key tool for helping folk learn the ropes of the format.
Please can we temporarily suspend this rule?
As a moderator, you can exempt folks from this restriction on a case-by-case basis. See: Allow inviting people with rep < 20 to private chat? for details.
Exempting an entire room would be asking for trouble, I fear.
Anything you can do to guide folks that doesn't require extensive one-on-one support will probably pay off in the long run.