I'm not sure why there is such a dearth of these items, but I'm finding it extremely difficult (and frustrating) trying to reconcile hard drives with my 2018 macbook pro with my 2013 mac pro, namely reconciling the thunderbolt 2 ecosystem with the usb-c/thunderbolt 3. Does anyone have silver bullet solution for a either a dongle or cable that allow thunderbolt 2 to thunderbolt 3/usb-c interfacing? I cannot connect usb-c drives to my mac pro. At the same time, I cannot connect my many thunderbolt portable hard drives with my macbook pro. There is the apple thunderbolt2 to thunderbolt 3 adapter, which is useless to me, as it does not allow for bus power both ways. This feels like such a 2005-style problem, but here we are and I cannot find a good solution. Even all the new thunderbolt 3/usb-c hubs don't seem to have thunderbolt 1/2 connections available. Mini displayport if you're lucky, but that doesn't help me.