I mean, think of it logically. When you're voice chatting, what if the second person has a damaged left ear bud, and you have panned yourself towards the left. Will it not be very challenging for said person to hear what you're saying? I do understand how blind people prefer this for other reasons such as their obvious preference to good sound, as that is how they imagine the world around them which is completely logical and I have no objections for that but, a mainstream app such as discord is unlikely to cater to needs of specific communities in the sense that they will not go into the nitty-gritty, and expect everybody to take one step forward, a step out of their comfort zone and adjust. Which, I think is a completely logical thing to do.
I would only quickly like to point out that this is really not how it works. First of all, stereo is far from anything that is useful only to the blind community. More importantly, if you have a damaged left speaker / earbud, that is exclusively your problem. Every operating system nowadays offers something called Mono audio, which would switch all sounds to be heard equally through both channels. This is useful for other hearing disabilities, but also for the example above you mentioned. Stereo audio isn't excluded because someone has a broken earbud, that's like saying don't add images because blind people can't see them.
Now regarding this conversation, Skype VS Discord is the most useless debate. Use what works for you. Fact is that Skype had all kinds of lags and freezes with screen rreaders, and all hate it was getting was fully justified, since it took a year for Microsoft to address those, and it is fixed only now in the latest 8.71 update. This latest update introduced other accessibility problems, but let's not talk about that for now. We should also be realistic and say that Discord was ignoring accessibility for a year too, even longer, and they only needed to do some basics like labeling buttons and adding menu roles where necessary.
However, the topic here talks about a Discord server, I do have to be honest and say that I don't see how a Skype VS Discord VS whatever discussion is even relevant here. Either you join a server if you like that and use Discord, or you don't use Discord and just move on.
Discord doesn't have the loading problem mentioned above, at least for me. Maybe it does on a lower configuration, I am not sure, but I haven't seen this. Also, it's main layout definitely hasn't changed in a few months, not even in a year, so if you were using it then, I don't know what additional buttons you speak of. Full of struggling equals waiting 15 seconds for a Skype conversation to load, not having to go through a few buttons, and even if you have to wait a few seconds for the page to scroll, which definitely isn't normal behaviour.