I don't think your point stands at all.
If you're asking how someone is supposed to know without knowing then the answer is you can't. Obviously.
You looked at biased reviews that had clearly not tested the product in the manner of which you wanted to use it. You made a bad purchase. I'm sorry. But that's not the fault of Bluetooth. That's the fault of Sony.
Are you going to claim that smartphones are hot garbage just because Nokia made a really shitty one? They were a reputable phone brand too. Until they weren't. Maybe you just learned that the hard way with Sony.