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> My main interest is in Bluetooth 5

Bluetooth 5 does not help you here at all. Stereo audio is still done over Bluetooth classic which has not been updated since version 2.1

source: i work on bluetooth

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Ah, damn. I'd heard from other sources when Bluetooth 5 was first coming out that increased bandwidth was part of the spec, so I was hoping that would resolve my congestion woes. 2.4ghz is unusable at some points in the city. It's rumored that's why the 7 train's CBTC setup took so much longer than planned.

Yes. Bluetooth low energy in Bluetooth 5.0 now supports two megabits per second data rate, up from the previous speed of 1 megabit per second. The problem is, none of that matters for audio, because audio is never sent over bluetooth low energy. It is sent over Bluetooth classic. The specification for audio over Bluetooth low energy is not out yet.

Not arguing with your knowledge, but how does the LDAC codec on Sony headphones work then? Is this a later standard or a crowbar?

A2dp optionally allows multiple codecs. Anyone can make their own. Codecs are negotiated at connection time and if the headphones and device both support a given codec, they can choose to use it. SBC is mandatory, all others optional, including ones you can invent later (even after the spec is final and in use).

Thank you, that's interesting.

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