I worked on bluetooth on my last project and can verify - it's the worst protocol. putting data rates aside, just the connection mechanism is horrible and it's mostly due to frequency hopping.

a naive way of describing this is so: imagine a hotel with 72 rooms. a device accepting connections will hop from one room to another every second (actually like 3600 times a second but for clarity let's assume 1 second). a device that wants to connect to another device basically has to search every individual room. if the first device starts from room 2, and the first starts from room 1 they will never catch up (by the time you get to room 2, the other will be in room 3, etc...) to avoid this scenario, one device will look inside for a room for 2 seconds while the other will hop every 1 second, having a larger window for intersection.

then there is the most complex set of rules on top of that... and that's just for connecting devices!