My suspicion is, that #TeufelAudio has very little control over their
Bluetooth-Audio features.

The #ATS2835P, used in the #MYND, supports neither LE-Audio nor Auracast. Party-Link uses proprietary broadcom CSB.

Presumably, they can license addon firmware modules/codes, but that's it.

Changing to ATS2835P2 would enable #Auracast, but would make it incompatible with existing MYNDs. (not a big deal)

Thanks to @neuron for finding this overview:
https://www.actionstech.com/index.php?id=3581&siteId=4