I could see Bluetooth being useful if the keyboard allows for easily switching between devices: your significant other texts you on the phone, so you quickly switch it to your phone to type out a message, then switch back. (I don't know if this keyboard can do that though.)

I bought a wireless Microsoft ergonomic keyboard a decade ago, with the idea that I could kickback in my chair, with my feet on the desk, and type away with the keyboard in my lap. I've done that maybe five times in the ten years of owning the keyboard. It was not worth the dropped/overly-repeated keypresses over the years (though it was wireless, but not Bluetooth).

I'm looking forward to getting my glove80 in the next month or two, which supports multiple devices via Bluetooth or one device via USB.