you mean like the low latency aptxll and other bluetooth styles? yeah, like BTR3K from FIIO. Solid for its price
almost all beyers have removable ear pads… don’t let marketing on that fool you, the only thing they did was install plastic clip on adapters to the back of the pads. Other beyers like 880 just have to use the leather lip of the pad to put on the headphone… its more of a hassle to change them but they are still interchangeable… currently there is no replacement alternatives to the new beyers due to the new adapter being used.
you mean like the 7.1 virtual or things like dolby atmos and hesuvi? Most of that is all software base and can be implemented into anything… if its pc based dolby atmos is like… $1 for that kinda stuff. Though I caution on using it as it tends to ruin a headphones sound in most cases… spacious audio is just artificially implementing a large soundstage… if your headphone already has a large airy soundstage it will just sound terrible… headphones like the hifimans aren’t the best for this as they already have that huge airy sound as an example