Bluetooth (and BLE) optimizes for a different set of constraints: low cost, low power. It performs terribly if you have thousands of devices in a small room (basically any conference or convention).
Or if you make the mistake of changing all of your light bulbs for Bluetooth LED light bulbs. Have to fight to turn on the damn lights on all the time.
I have never had a Bluetooth headset that doesn't sometimes cut out when my phone is in my pocket.
My Apple Watch battery drains in hours when I forget to place it in Airplane mode when I am at a convention. Soooo many Bluetooth devices in one place makes it very unhappy.