Is there a benefit/downside of closing Ink cards I’m not using anymore?
If you do close, make sure you transfer any UR associated with those accounts to other chase UR cards before closing (since UR is associated with each card, as opposed to the Amex MR pooling methodology).
One other callout: do you have other chase cards that allow for UR-to-airline transfers? That could be a potential downside depending on your remaining card portfolio.