Smaller footprint in my mind doesn't refer to download size which is minimal in either case but the footprint or impact on a project. IMO It is way harder to move off of jquery once it has been fully utilized throughout the project than to swap a single function to/from lodash once a core API has a better way of handling it. Using JQuery demands you buy into the whole ecosystem whereas Lodash is modular.

Also as others have mentioned caches are individually isolated for each domain now to prevent tracking/data leaks.