As someone who has pretty heavily used a Rift 2 for 5+ years now, primarily its ergonomics and comfort. More physical activities can result in the foam around

As someone who has pretty heavily used a Rift 2 for 5+ years now, primarily its ergonomics and comfort. More physical activities can result in the foam around the eye piece absorbing a goodly quantity of sweat (addressable e.g. with the plastic cover that comes with the Quest 2 or aftermarket alternatives) which just feels gross and can lead to more humidity being trapped within the headset, fogging the lenses, and so on. The weight is a bit awkward, and different straps can help distribute it better and stay comfortable for longer. The ear phones can be uncomfortable after a time as well, pressing down on the ears as they do. If they were a cupping style like high end headphones, that would help a lot. I do find that the tethered units like the Rift are more comfortable for longer than the self contained units like the Quest, since they offload processing, power, etc and the attendant weight, to the desktop machine. Eye strain does add up eventually, and newer headsets have better screens but I wonder if this is just a truly insurmountable problem of mounting screens mere inches from your eyes.