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I don't think so. But I also have never used ARC and don't plan to.

I also wanted to clarify that even if the source was an app in the TV, it would still work in up to 5.1, you just wouldn't be able to get Atmos.

You are correct. Your TV does NOT need to have eARC for exactly the reason you specified. It would only be needed if the source was an app in the TV. External streaming devices, especially an AppleTV 4K work much better.