Is the direct USB-C to ethernet Apples dongle or a third party dongle?That was a straw man: there's a direct USB-C to Ethernet dongle that costs less than the TB2-to-3 adapter alone.
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Actually, that is one piece of genuine good news: remember, the 27" iMac got Skylake chips last year, and AFAIK there's no suitable Kaby Lake chip for it yet, so it's not a bad purchase, especially if you're not ready to convert your life to USB-C...