I understand the skepticism regarding cable swapping, even if I do not entirely share it. However, the Edition XV2 has the astonishing disadvantage of not having come with any kind of stock balanced cable option, even though, on some HP amps, replacing the stock cable with a 4-pin balanced cable does make an immediately noticeable, and quite dramatic, difference to the sq. on different levels. I verified this myself, when I had the XV2, by replacing the stock SE cable with my 4--pin balanced Sennheiser CH-700S cable (which is meant for the HD 700). I tried it balanced on both my Violectric V281 and Bryston 2b LP, and in both cases, the difference was not at all subtle. All that immediately did was make me wonder why Hifiman would shoot themselves in the foot, so to speak, by not including a 4-pin balanced cable in the XV2 package as an option, especially given how much these cans cost...
With all that said, experimenting with their stock balanced cables, even when they're are included, reveal weaknesses when compared with other types of cables. I have experienced that difference too with both the He-6 and the He-1000 by replacing the stock with different cables from Norne Audio, but that is another story altogether, which is better left for another context, since I do not want to go off the topic of the Edition X.
My point here is that the non-inclusion of a balanced cable in the XV2 package renders one essential because of the important difference it can make when used with some amps on which the balanced outputs are enhanced for better performance than the SE outputs.