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It's not ideal. It does force you to keep that first computer on all the time.
But then... if you were to get a Mac Mini you'd have to leave that on all the time too.
The advantage of the TB+Ethernet route is that 1 of the Macs get really stunning performance and the other is pretty damn good.
The advantage of the Mac Mini Ethernet route is that both Macs get pretty damn good performance, and you can power either off at any time and the Mac Mini uses less power 24/7.
I generally like to segregate my storage away from a primary computer, so that I have freedom to change anything later, and so that anything can fail without it impacting others (or at least being cheaply and quickly replaceable). So that lends itself to the Mac Mini route too.
But you can basically prove the idea with the TB+Ether route and then buy the Mac Mini at a later date.
Much obliged David, once OS install finishes I'll try prob the second combination (TB+Cat6) and hope to report good news.