In theory, jQuery can be brought in by reference from Google Hosted Libraries or cdnjs or whatnot, cached for a long time, and reused in any other website that

In theory, jQuery can be brought in by reference from Google Hosted Libraries or cdnjs or whatnot, cached for a long time, and reused in any other website that uses the same external host and version. You can't say the same about your tree-shaken thingy... However, I'm not experienced enough to say how well that works in practice.