>Still, a lot of old iPods can easily decode Opus if you run Rockbox on them as far as I know,

For personal usage. Yes. But I was answering in terms of wider context in consumer. They don't know anything about Rockbox.

>The argument for Opus in streaming is still strong on its own. If we pit 128kbps Opus against 256kbps AAC-LC, that's obviously a 50% reduction in bandwidth for similar quality.

It is not similar quality. Not even close.