Yeah, let's introduce a major structural flaw and a point of failure to a perfectly sound design :agony-shrooms:
And for what?
"Foldable headphones are so convenient and portable when you're not using them!!"
YOU WEAR THEM AROUND YOUR NECK WHEN NOT USING THEM, DIPSHIT
These stupid hinges turn cheap headphones from durable and reliable backups to instant e-waste
Source: just had a pair of cheap bluetooth headphones crack at the hinges because it was slightly below freezing
My understanding is that until fairly recently, Bluetooth bandwidth and transfer rate stability was so shit that audio playback relied on heavily and variably lossy compression, which made it pointless for audiophile quality headphones. With modern BT specs however I imagine "transparent" (ie non-discernible) compression isn't a problem. Especially if you stream music from Spotify or whatever, then what you get is pretty much equivalent. On most phones it's probably better actually.
Also, having to bundle the DAC and amplifier circuitry into the unit itself is fairly limiting in terms of what you can achieve. Although for the vast majority of users that doesn't really mean anything.
So yeah I imagine the "hate" will dissipate soon enough. I've been happy with my ATH-M50XBT2. I wouldn't bother with anything more high end than that though.