older android (pre android11 or so) phones had a bug that prevented communicating with more than 10 paired devices at once (LE). many bluetooth designs are point to point, so they do not support connecting to multiple at once. multimedia support on Bluetooth only supports one or two simultaneous connections. if it is an LE device, your phone can connect to all of your devices at once, an example: apple airtags, they may not even be yours, but yours and everyone’s phones are connecting to them all the time if they are in range.
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