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To clarify again, pass-through is a different thing. Digital TVs have always sent 5.1 when available from internal sources such as the broadcast tuner and internal apps. Pass-through refers to what it does to stuff that comes in through hdmi. At first, TVs all sent out two channel only...

Nothing has changed. It has always been this way. Read the distinction again. Optical has always provided 5.1 from the internal apps and tuner. Of course, that's as long as the source is 5.1. It's hdmi pass-through that typically is only two channel on optical, but some TVs also pass-through...

Optical will always provide 5.1 from the TV’s internal apps and tuner. It often only provides two channel pass-through from hdmi inputs.

The real issue is that most of the time ARC is a pain in the ass. It works far less often than it should. For streaming, you're really better off with an external streaming device, which can be had for as little as $30, and if you're using the TV's internal tuner, there is no real-world...