True wireless earbuds don't necessarily have to end up as electronic waste when their batteries reach the end of their lifespan. Fairphone demonstrates this with the Fairbuds 2, whose batteries can be easily replaced. The earbuds also offer active noise cancellation and support for Sony LDAC.
AFAIK there’s an upper limit to how good can they sound anyway because Bluetooth is kinda crap for audio.
Depends upon the codecs supported by all hardware involved. If your sending device supports it, these new buds support decent quality.