The problem with that is that things change. You'd be reading through 200 pages of, at best, somewhat accurate information and at worst completely outdated info and data.
The benefit of Discord is in several things:
- Highly active communities with contributors who really know what they are talking about. Speaking about the Hunter discord, I'm confident that you'll get an answer to whatever question within 5 minutes (often much less). Even if you ask your question at the worst possible time (like 5am CET), there's always someone who will pick it up and expand on it later on. While there's plenty of banter in Discord, the Hunter one is actually quite civil and even the shitposting is relatively decent (compared to the Rogue Discord for example, which is a mess).
- There is permanence in the form of channel pins and they are being maintained properly. Plenty of servers have the most relevant information set up in one or several pins so you can quickly and easily weed out the most crucial posts that you "need" to read.
- Discord fosters exploratory discussion like a forum never could, because you interact in real time. Coming from someone who grew up in the mIRC era (as a gamer), I thoroughly enjoy going back to this.
There is some merit of course to how you can catalogue very specific topics of discussion effortlessly on forums, something you can't do to that extend on Discord, but I feel like the 2 complement each other perfectly. If only there were way more active users on this forum, that's always been the issue with forums, it still attracts a fairly limited type of gamer who enjoys discussing and interacting like this.
Class Discords, and how they grew into what they are today in a very large part thanks to the contributions of a small amount of highly involved individuals, is the best thing that happened to WoW communities since the introduction of Paid Server Transfers.