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What irks me is the lack of an Ethernet port. Would a USB-C to Ethernet adapter work?

Yes, but there are reports of the USB hubs in these particular monitors being unreliable. Anyway why do you expect your monitor to have Ethernet?

The Apple monitors that these LGs are replacing had built-in Ethernet ports.

Apple's monitors had one and like them, LG's monitors are kinda marketed as docking stations. Missed opportunity to make an awesome product.