Reminds me of so many people I've worked with who think it matters to consumers/users why something doesn't work. Like they can justify it, and it's not that big a deal.
To be fair, that's not the intended function of earphones.
I mostly solve this by carrying my phone in a side rather than a back pocket. But it still cuts out if I turn my head far enough to the side, as when checking traffic in a road I'm about to cross. Them's the breaks - if you want to wear a radio receiver in your ear and carry the transmitter in your pocket, there's some physics you pretty much just have to deal with.
Don't get me wrong - I totally get being upset with $150 earbuds that don't work reliably, especially when they're sold startup-style as the best thing since sliced bread and the cure for all the world's mobile-audio-related ills. But if that's your budget and solid signal in all circumstances is your major criterion, you might be better served by something that goes beyond the pure earbud form factor, like Apple's ones that have the antenna in an extension that puts it outside the pinna.
I was just trying to indicate that what he was saying wasn't just a hyperbolic/flippant statement, but a use-case not fulfilled by the product.
I guess there's no easy way round the fact that we're ugly giant bags of mostly water :-)
For comparison, my Rowkin Mini does fine anywhere in my apartment when my phone's sitting on the shelf by the door - but only if I happen to be oriented such that my head isn't between the earbud and the phone. If I turn to face the opposite direction, it cuts out and stays out unless I'm within about six feet. So the problem doesn't lie with the receiver per se, but with the thick layer of RF insulation that a human body can put between the receiver and the signal it's meant to pick up.
I don't think it's a totally insoluble problem. But it is a very hard one. As I said before, I get the dissatisfaction with $300 earbuds that don't perform up to the claimed spec. But, to the best of my knowledge, there is no fully in-ear Bluetooth earbud available for any price which won't exhibit the same behavior to a greater or lesser degree.
The issue is water, not walls. I had a pair of bluetooth earbuds that I could set on a table and walk all around my apartment between rooms no problem, but using in a pocket in my cargo pants they'd cut out due to my body (what is it, 60% water?) covering the line of sight between the buds and my phone.
That said form follows function. If you've designed earbuds that fail to defy the laws of physics you shouldn't sell them.