I understood that they need to deal with new codec inclusion, via GStreamer o 
other libs,
and that writing code and manage a community is not a simple task.

Said that,

IMHO there are three big question with bluetooth and PulseAudio:
1. in these days we (probably most of us) are always on web conferencing and we 
need good audio quality in both direction, mic and speaker.
Current bluetooth headsets are capable of using Bluetooth Profile HFP 1.6 with 
mSBC 16kHz audio encoding, this standard permit high quality voice conferencing 
and It was made in 2011...9 year ago.

2. Bluetooth Profile A2DP for listening only (music...) There are a lot of 
codec for 
high quality listen audio, es. SBC-XQ, aptX-LL, aptX-HD, aptX Voice and 
FastStream

3. Support for new version of Bluetooth / Profile. Ex #1 BT 5.3 with LC3
(Low Complexity Communications Coded (LC3)) codec. Ex #2 BT Profile HFP
1.8 with codec selection and Enhanced Voice Recognition Activation.

My two cents

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https://bugs.launchpad.net/bugs/1838151

Title:
  Poor quality audio with modern Bluetooth headsets in HSP/HFP.  Missing
  wide band speech support (Bluetooth A2DP codecs).

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