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It has plenty of bandwidth. MB/s

Source? The only option that I'm aware of that exists in Bluetooth spec is an optional add-on that basically initiates an 802.11 (WiFi) ad-hoc link for faster transfer. Not really suitable for audio.

Max bandwidth for regular Bluetooth is around 3 Mbit/s, to my knowledge. Bluetooth LE is lower at 2 Mbit/s.

2 Mbit/s is the physical bit rate using LE 2M. After accounting for protocol overhead, the max data rate is about 1.4 Mbps.

https://www.novelbits.io/bluetooth-5-speed-maximum-throughpu...

Coincidentally (or not?) That's the bitrate of uncompressed CDDA. I suspect the real-word data rate is lower though.

In any event 300kbps is more than sufficient for transparent compression of audio and, if the source is lossless, then you shouldn't have recompression artifacts. Doing so in real-time does have costs (low latency compression uses both more CPU time and ends up with higher bitrates than when you allow more latency)

What's the latency like at high bitrates though?

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