To be fair, "servers" came organically from some of the community relatively early on. (One alleged place where it came from was communities migrating from TeamSpeak where "server" was the word there, which would make sense as a particular place it came from given the early focus on game players. Another alleged source was some huge non-technical communities that were also early adopters of Discord.)

I sort of prefer "guilds" for technical reasons, too, and also from enough work on Discord bot development where that terminology is far more common because it is in all the API documentation. But I think a lot of that ship has sailed for non-technical reasons of "it is just how everyone talks about Discord".

(Also, technically Discord does shard the heaviest "guilds" in its server clusters in such a way that the technical resemblance to "server" isn't far off if you want to feel better about the non-technical "server" terminology.)