I found them dumped out in the “street” in a place ordained by law as public domain. So I just grabbed up the media and use it in private.

I am (clearly) not as far down the rabbithole as the commenter you're replying to, but almost certainly not. Streaming 4k blueray is on the order or ~100Mb/s, which means on a LAN bog-standard gigabit ethernet and associated networking hardware would be more than sufficient.

This is taking a hobby to its extremes, in much the same way that a $5k boat and $500k boat let you catch the same fish.

You are totally right, it’s mostly just for backups and transfers to rebalance data.