BLE is fine for very short range connections like body area networks, which is what it was designed for, but this is not the IoT for most of us and BLE is not truly an "IoT" technology in any meaningful sense any more than barcodes are an IoT technology. "Works great" is something most IoT developers have never and will never say about BT and due to its limitations, BLE as well. BLE also requires a cloud lookup in most cases so total connection times can many seconds or even minutes.
The IoT needs "saving" from the kind of thinking that says BLE is "all we need" for the IoT, not unlike the early days of TV where radio people said we don't need TV, etc.