@prastle 👋 the reason for discord is the live voice capability. It's a glorified phone call.
Discord overall is good for that kind of thing, also good for getting quicker answers to questions.
Though, forums will remain the place to be for a sustained, longer, more in depth conversation. A chat room like discord will tend to have very ephemeral topics, usually one at a time. While forum threads do fall off the top, they still stick around.
Overall, discord will be a good place when you want to have a phone call, or a meeting, or a question answered in a couple hours or a day. Forums is best though for raising topics where you're happy accumulating a response days, maybe weeks later.