I replaced some CAT 5 between the Core server and the Router with shielded advertised CAT 7 and didn’t notice any difference in SQ. YMMV.
I think the main difference is that CAT 7 has heavier shielding. That might make a difference with long cable runs in a very RF noisy environment, but in the ordinary home it’s unlikely to matter.
One thing if you do go for shielded cable generally (whether 6, 6a or 7) however, is that the shield can create a galvanic connection between components that can carry noise on an earth into your “clean side” equipment. If you look closely at your MacMini Ethernet socket you may seen some small studs on either side which are intended to form a connection with the shield on a shielded plug and cable. If your Ethernet connector lacks such studs then the shield will not be grounded, meaning it won’t be as effective as a shield but will also not carry noise. If you do see such studs then using a shielded cable may introduce more noise than it shields. Some shielded cables have a floating shield which is disconnected at one end to avoid any galvanic connection.