A lot of people here don't understand Discord was born as an alternative to Teamspeak, Mumble and Ventrilo, which main purpose is voicechat rooms while playing video games. They were difficult to maintain since you had to install your own servers. Discord swept with them with the ease of setup and generous free tiers.

If you don't use it with that purpose, there's tons of alternatives.

I think you're right, but Discord also replaced IRC for a lot of people/communities, and I don't think they all make use of the voice chat feature. It may be there's no perfect alternative for everyone, but we could still "save" a large group.

In most discord groups I see voice is just this weird feature no one uses.

Even when people insist on organizing a telecon they usually use zoom, teams, or google meet instead.