Complaining about 3000 pages of spec, in comparison to WiFi, is a bit apples-to-oranges. A lot of Bluetooth is not just the binary protocol. There is a huge surface area of what basically amounts to RPC protocols for different, standardized device interfaces. Bluetooth is a wonder for having things like heart rate monitors, pointing devices, and audio interfaces specified in a single, standardized way. You can generally count on a BT device from literally thousands of vendors to behave in the same way in literally thousands of different client devices.

It's more fair to compare BT to heavy protocols like ZigBee, or worse yet, ZWave. If you wanna dig into a shit-show of wireless protocols, look no further than ZWave. That thing is a complete boondoggle.

I've been pretty happy with BT.